Error "A JNI error has occurred. Please check your installation and try again in Eclipse x86 Windows 8.1"

Question

Consider:

public class LoginCumReg implements ActionListener, KeyListener {

    private JFrame form;
    private JTextField txtunm;
    private JTextField txtnm;
    private JTextField txteml;
    private JButton cmdcreate;
    private JPasswordField txtpass;
    private JPasswordField txtpassreg;
    private JButton cmdok;
    private JLabel lblunm;
    private JLabel lblpass;
    private JLabel lbleml;
    private JLabel lblpassreg;
    private JLabel lblnm;
    private JPanel panel_1;

    public LoginCumReg() {
        // Construct components
        form = new JFrame("Sign Up");
        form.getContentPane().setFont(
                new Font("Plantagenet Cherokee", Font.BOLD, 18));
        txtunm = new JTextField(5);
        txtunm.addKeyListener(this);
        txtunm.setBounds(637, 55, 100, 25);
        txtnm = new JTextField(5);
        txtnm.setBounds(637, 228, 100, 25);
        txteml = new JTextField(5);
        txteml.setBounds(637, 264, 100, 25);
        cmdcreate = new JButton("Create Account");
        cmdcreate.setBounds(527, 350, 188, 25);
        txtpass = new JPasswordField(5);
        txtpass.setBounds(637, 91, 100, 25);
        txtpassreg = new JPasswordField(5);
        txtpassreg.setBounds(637, 300, 100, 25);
        cmdok = new JButton("OK");
        cmdok.setBounds(527, 139, 100, 25);
        lblunm = new JLabel("UserName");
        lblunm.setBounds(527, 55, 73, 25);
        lblpass = new JLabel("Password");
        lblpass.setBounds(527, 91, 100, 25);
        lbleml = new JLabel("Email ID");
        lbleml.setBounds(527, 264, 100, 25);
        lblpassreg = new JLabel("Password");
        lblpassreg.setBounds(527, 300, 100, 25);
        lblnm = new JLabel("Full Name");
        lblnm.setBounds(527, 228, 100, 25);

        // form.setResizable(false);

        // Adjust size and set layout
        form.setPreferredSize(new Dimension(800, 450));

        form.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        form.getContentPane().setLayout(null);

        // Add components
        form.getContentPane().add(txtunm);
        form.getContentPane().add(txtnm);
        form.getContentPane().add(txteml);
        form.getContentPane().add(cmdcreate);
        form.getContentPane().add(txtpass);
        form.getContentPane().add(txtpassreg);
        form.getContentPane().add(cmdok);
        form.getContentPane().add(lblunm);
        form.getContentPane().add(lblpass);
        form.getContentPane().add(lbleml);
        form.getContentPane().add(lblpassreg);
        form.getContentPane().add(lblnm);

        cmdcreate.setActionCommand("Create Account");
        cmdcreate.addActionListener(this);
        cmdok.setActionCommand("Login");

        JPanel panel = new JPanel();
        panel.setBounds(502, 29, 254, 154);
        panel.setFont(new Font("Palatino Linotype", Font.PLAIN, 14));
        panel.setBorder(new TitledBorder(new EtchedBorder(EtchedBorder.RAISED,
                null, null), "LOGIN", TitledBorder.LEADING, TitledBorder.TOP,
                null, null));
        panel.setBackground(SystemColor.controlHighlight);
        form.getContentPane().add(panel);

        panel_1 = new JPanel();
        panel_1.setBounds(500, 204, 254, 186);
        panel_1.setFont(new Font("Palatino Linotype", Font.PLAIN, 14));
        panel_1.setBorder(new TitledBorder(new EtchedBorder(
                EtchedBorder.RAISED, null, null), "SIGN UP",
                TitledBorder.LEADING, TitledBorder.TOP, null, null));
        panel_1.setBackground(SystemColor.controlHighlight);
        form.getContentPane().add(panel_1);

        JLabel lblNewLabel = new JLabel("New label");
        lblNewLabel.setBounds(91, 139, 286, 101);
        lblNewLabel.setIcon(new ImageIcon(
                "C:\\Users\\JAsh\\Desktop\\Projects\\JAsh.png"));
        form.getContentPane().add(lblNewLabel);

        JPanel panel_2 = new JPanel();
        panel_2.setBounds(77, 118, 315, 145);
        panel_2.setBorder(new EtchedBorder(EtchedBorder.RAISED,
                SystemColor.activeCaptionBorder, SystemColor.menu));
        panel_2.setBackground(SystemColor.controlHighlight);
        form.getContentPane().add(panel_2);
        cmdok.addActionListener(this);

        form.setResizable(false);
        form.pack();
        form.setVisible(true);
        System.out.println("const..");
    }

    public static void main(String[] args) {
        new LoginCumReg();
    }

    @Override
    public void actionPerformed(ActionEvent ae) {
        // TODO Auto-generated method stub

        if (ae.getActionCommand().equals("Create Account")) {
            new Registration(txtnm.getText(), txteml.getText(), new String(
                    txtpassreg.getPassword()));
            form.setVisible(false);
        }

        if (ae.getActionCommand().equals("Login")) {
            try {
                if (txtunm.getText().equalsIgnoreCase("admin")
                        && new String(txtpass.getPassword()).equals("admin")) {
                    form.setVisible(false);
                    new Admin();
                } else {
                    DataBase db = new DataBase();
                    db.connect();
                    String sql = "SELECT * FROM LOGIN WHERE USERNAME='"
                            + txtunm.getText() + "'";
                    ResultSet rs = db.getDDL(sql);
                    boolean found = false;
                    while (rs.next()) {
                        if (rs.getString("Password").equals(
                                new String(txtpass.getPassword()))) {
                            found = true;
                            form.setVisible(false);
                            String name = rs.getString("FullName");
                            Session.startSession(txtunm.getText(), name);
                            new FacultyWelcome();
                        }
                    }
                    if (!found)
                        JOptionPane.showMessageDialog(new JFrame(),
                                "Invalid Credentials");
                    db.close();
                }
            }
            catch (Exception e) {
            }
        }
    }

    @Override
    public void keyPressed(KeyEvent arg0) {
        // TODO Auto-generated method stub
    }

    @Override
    public void keyReleased(KeyEvent arg0) {
        // TODO Auto-generated method stub
    }

    @Override
    public void keyTyped(KeyEvent arg0) {

        // TODO Auto-generated method stub
        // JOptionPane.showMessageDialog(new JFrame(), arg0.getKeyChar() + "-" + arg0.getKeyCode());
    }
}

The above code works perfectly on my friend's laptop and throws this error on my laptop. I have running the code on Eclipse v4.2 (Juno) using Java 7.

I have also tested and run a lot of Java programs on my laptop all works well. This is the only program which gives such an error.

How can I fix this problem?

I faced the same problem with jdk-8u144-windows-x64.exe in Windows 10 — Ripon Al Wasim, Sep 14 '17 at 12:02
https://stackoverflow.com/questions/33613857/noclassdeffounderror-while-executing-main-class-using-java-classpath-command/33616594#33616594 — Rajat, Mar 08 '19 at 07:11
"please check your installation" -- my installation of what? — Brent Bradburn, May 01 '19 at 22:07
Your installation of Eclipse + any plugins. Look in the Eclipse logfile for clues. — Stephen C, Oct 17 '20 at 02:03
Is this question specific to Eclipse or not? It is attracting answers about [Gradle](https://en.wikipedia.org/wiki/Gradle), [IntelliJ IDEA](https://en.wikipedia.org/wiki/IntelliJ_IDEA), [NetBeans](https://en.wikipedia.org/wiki/NetBeans), etc. — Peter Mortensen, May 23 '22 at 20:28
You can get this error not setting ANT Home or wrong setting in your preferences too. — Aly González, Jan 28 '23 at 22:19

score 72 · Answer 1 · edited May 23 '22 at 20:23

72

I have been having this problem for a while, but now I have figured it out.

It turns out that Java JDK 12 has both the JRE and the JDK inside the bin folder of the Java 12 JDK. (I have always believed that JRE and JDK are different application, but it turns out things have changed.)

My problem was that I had Java JDK 12 installed on my computer. At the same time, I had Java 8 (JRE) Installed on my computer. So my computer was getting confused.

With my command prompt environment set up to run Java and Javac commands:

I typed the follow commands:

java -version

This gave me Java 8.

After that, I typed:

javac -version

This gave me Java 12.

In other words, my program is getting compiled with Java 12 and I am trying to run with Java 8.

To solve the problem, I uninstalled Java 8 JRE from my computer.

I went back to command prompt to check if "java -version" and "javac -version" was returning the same version number, and yes, it was returning Java 12.

I tried recompiling my program again, and running it. It worked!!

edited May 23 '22 at 20:23

Peter Mortensen

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answered Sep 04 '19 at 22:35

Professor

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This worked for me but I left Java 8 on the system and I had to change the properties of the project to use Java 12. No more JNI error. – nicomp Sep 30 '19 at 14:47
3

You do not need to uninstall `java 8`, just configure your java versions on your system `sudo update-alternatives --config javac; sudo update-alternatives --config java ` – Nicole Finnie May 31 '20 at 09:12
@NicoleFinnie Too complicated and took much work. – NoName Jan 14 '22 at 16:44
*"I have always believed that JRE and JDK are different application, but it turns out things have changed."* - Nope. Nothing has changed. A JDK has always included a JRE. All the way back to the Java 1.1 days. JREs and JDKs are different **distributions** not different applications. – Stephen C May 16 '22 at 01:35

score 54 · Accepted Answer · edited May 22 '22 at 23:14

54

Solution 1: Right-click on the class that contains the main method. Click on "Run As". Click on "Java Application". The keyboard shortcut is: Shift + Alt + X, J (while holding Shift and Alt, press X; then release Shift and Alt and press J).

Solution 2: As Professor mentioned, please make sure that java -version and javac -version are the same.

Note: Solution 1 is a quick fix and worked for me and a few other people. It may or may not work for you. I think Solution 2 is the proper way to solve it.

edited May 22 '22 at 23:14

Peter Mortensen

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answered Jul 20 '15 at 18:28

Positive Navid

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Your **Short Answer** Helped. Only I need to write a new application name and select my main function containing class. It worked like charm. – Jaffer Wilson Feb 04 '17 at 14:12
How do you resolve the error if the java file is a part of an android project on android studio – ubuntu_noob Jun 02 '18 at 10:33
1

On the project level, I referenced JRE library to 1.8.xx and worked for me.Thanks – Shetty's Sep 20 '19 at 10:30
Just worked for me when I deleted all project configuration files. Which is equivalent to create a new project. – axell-brendow Sep 21 '19 at 15:26
1

it seems that this occurs when eclipse itself uses different JDK from current Java Project, after checked -Djava.library.path of Java process started by Eclipse ant launcher, dll path of Eclipse JRE is placed first, Ant's one (used by launching configuration) is placed last, so I think this is a bug of Eclipse Ant launcher plugin. – Daniel Yang Jun 04 '20 at 04:06

c0der · Answer 3 · 2022-05-25T13:34:47.230

20

Running the jar from command line by:

C:\folder\where\jar\stored>java -jar JarName.jar

I got information which made the problem clearer:

main/Main has been compiled by a more recent version of the Java Runtime

In this case, the jar was compiled with a version newer than jre supports.

edited May 25 '22 at 13:34

answered Nov 29 '18 at 10:04

c0der

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How do you fix this? – Atnas Apr 04 '20 at 20:29
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@Atnas I changed the compiler jdk compliance. In Eclipse its under project properties > java compiler > jdk compliance – c0der Apr 05 '20 at 04:40
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@c0der this solved my problem thanks! – Assegd Oct 05 '21 at 06:02
Please review *[Should we edit a question to transcribe code from an image to text?](https://meta.stackoverflow.com/questions/415040)* and *[Why not upload images of code/errors when asking a question?](https://meta.stackoverflow.com/questions/285551/)* (e.g., *"Images should only be used to illustrate problems that* ***can't be made clear in any other way,*** *such as to provide screenshots of a user interface."*) and take the appropriate [action](https://stackoverflow.com/posts/53536389/edit) (it covers answers as well). – Peter Mortensen May 23 '22 at 20:10

score 13 · Answer 4 · edited May 23 '22 at 00:48

13

Error: A JNI error has occurred, please check your installation and try again in Eclipse

Solution: Check your package name as it may be colliding with the package name in Java. Simply change the package name to resolve your issue. :)

edited May 23 '22 at 00:48

Peter Mortensen

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answered Aug 16 '17 at 12:01

user8472395

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but what should I check ? – 诺铁 Oct 23 '19 at 02:56
check for "java" or "gradle" name – luis fernando yupanqui taco May 02 '21 at 01:22

score 13 · Answer 5 · edited May 23 '22 at 20:20

13

I solved it by changing my 'Compiler compliance level'. In Eclipse:

Menu Window → Preferences → Java → Compiler.

edited May 23 '22 at 20:20

Peter Mortensen

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answered Aug 09 '19 at 16:52

juancarlosun

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This worked for me. The "Run As' fix listed above didn't help. – nicomp Mar 25 '20 at 14:52
1

Thanks! The issue for me was that I previously had Java 12 installed and then went to Java 1.8, but Eclipse didn't pick up on the Java version change for the compliance level. – i01573 Oct 25 '21 at 15:46

score 10 · Answer 6 · edited Mar 22 '20 at 04:13

10

I had similar issues when using 'java' at the beginning of the package name, e.g. java.jem.pc

Check your console output, I was receiving:

Exception in thread "main" java.lang.SecurityException: Prohibited package name: java.jem.pc

edited Mar 22 '20 at 04:13

DennisLi

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answered Oct 19 '16 at 23:02

CoDeSigns

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Worked fine in my case... I was using package java, now updated and found working. Thanks – Sankumarsingh Nov 02 '17 at 14:00

score 9 · Answer 7 · edited May 23 '22 at 19:56

9

I faced a similar problem with a project, in IntelliJ with Maven dependencies.

I solved it changing the dependencies scope from provided to compile.

IntelliJ:

Menu → File → Project structure → Modules → Dependencies → *Scope (provide to) → Compile.

edited May 23 '22 at 19:56

Peter Mortensen

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answered Aug 22 '18 at 14:41

Salvador Vigo

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score 6 · Answer 8 · edited May 23 '22 at 00:50

In my case the issue was caused by the JDK version. To solve this I suggest to go into your POM file and check the <jdk.version>1.7</jdk.version>.

Afterwards, check the Java version in your cmd (Windows) or terminal (OS X or Linux) by typing: java -version.

Compare the version shown in the terminal/command prompt with what you have in your POM file. Make sure they are the same. Then run your project again.

score 5 · Answer 9 · edited May 22 '22 at 23:20

You can check the console first to see the actual error message and then proceed by looking for answers for that error.

My console shows the error NoClassDefFound for the class jcommander.

Your error will probably be different from mine. The cause of my error is that the class jcommander is not in my M2 repository, so I just have to add that dependency in my pom.xml file. You can check if all the class dependencies are all declared and added in your current configuration and project build.

NoClassDefFoundError

score 4 · Answer 10 · edited May 22 '22 at 23:21

4

I also faced the same issue. By looking at the console that's saying

java.lang.SecurityException issue.

the solution is: Check your package name of your project.

edited May 22 '22 at 23:21

Peter Mortensen

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answered Jan 16 '17 at 23:48

Devendra

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score 4 · Answer 11 · edited May 23 '22 at 00:44

4

It can happen if the JDK version is different.

Try this with Maven:

<properties>
    <jdk.version>1.8</jdk.version>
</properties>

under Build → plugins:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>2.3.2</version>
    <configuration>
        <source>${jdk.version}</source>
        <target>${jdk.version}</target>
    </configuration>

</plugin>

edited May 23 '22 at 00:44

Peter Mortensen

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answered Jun 12 '17 at 15:13

erank

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This solution works for me, thumbs up – Anas Dec 05 '21 at 13:02

score 3 · Answer 12 · edited May 23 '22 at 19:58

I have found that adding these lines of code to the pom.xml file of a Maven project solves similar issues for me:

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <configuration>
                <archive>
                    <manifest>
                        <mainClass>com.packagename.MainClassName</mainClass>
                    </manifest>
                </archive>
            </configuration>
        </plugin>

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <version>2.3</version>
            <configuration>
                <createDependencyReducedPom>false</createDependencyReducedPom>
            </configuration>
            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

This worked for me :) – Sebastián Vásquez Jun 24 '23 at 01:57 — Sebastián Vásquez, Jun 24 '23 at 01:57

score 3 · Answer 13 · edited May 23 '22 at 21:07

3

I was facing the same issue and in my case the compiler compliance level was selected as 14 in my Eclipse settings. In order to fix it, I changed it to the version of JDK on my machine i.e 1.8 and recompiled the project.

edited May 23 '22 at 21:07

Peter Mortensen

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answered Feb 20 '21 at 07:47

b.s

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score 2 · Answer 14 · answered Jul 03 '17 at 07:07

2

Check your console. It says java.lang.SecurityException issue. Change your 'package name'. I changed my package name from 'java.assessment' to 'assesment' and it worked for me. If somebody knows the root cause , let me know please.

answered Jul 03 '17 at 07:07

Keshav Bisarwal

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score 2 · Answer 15 · answered Jul 03 '19 at 09:17

2

I experienced the same issue, however in my case it was due to the Configuration settings in IntelliJ IDEA.

Even though the project SDK (File -> Project Structure) was set to Java 11, the JRE in the Run/Debug Configurations (Run -> Edit Configurations) was set to Java 8. After changing that to Java 11, it worked like a charm.

answered Jul 03 '19 at 09:17

dbakiu

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What ***exact*** error message did you get? Please respond by [editing (changing) your answer](https://stackoverflow.com/posts/56866792/edit), not here in comments (***without*** "Edit:", "Update:", or similar - the answer should appear as if it was written today). – Peter Mortensen May 23 '22 at 20:14

score 1 · Answer 16 · edited May 22 '22 at 23:15

1

I faced a similar problem and then got the solution in the package name.

I kept the package name as java.basics. In the console I got a hint for that as it clearly said "Prohibited package name". So I changed the package name and it worked.

edited May 22 '22 at 23:15

Peter Mortensen

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answered Apr 09 '16 at 20:20

H S Rathore

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score 1 · Answer 17 · edited May 23 '22 at 00:57

Possible solution

If none of these solutions worked for you then try this... I finally got mine working by deleting the two folders ".metadata" and ".recommenders" in the workspace folder.

You can find your workspace folder path by clicking on menu File → Switch Workspace → Other in the Eclipse application's toolbar.

Now I am a complete noob crying my way through an software engineering degree at San Jose State University. So I am just sharing what worked for me without knowing much knowledge of why exactly.

I do not know what harm or headaches, or even if both aforementioned folders needed to be deleted. But in the end, it worked for me and it seems the application just recreates fresh versions of those folders anyway.

score 1 · Answer 18 · edited May 23 '22 at 21:04

Error/Issue:

While trying to run my application as a Java application or as a Spring Boot application, I am getting below error

A JNI error has occurred, please check your installation and try again. A Java exception has occurred.

As well as getting this error in the console:

Exception in thread "main" java.lang.UnsupportedClassVersionError: com/example/demo/IocApplication has been compiled by a more recent version of the Java Runtime (class file version 55.0). This version of the Java Runtime only recognizes class file versions up to 52.0`

What is the root cause?

The reason for this error is that

the code is getting compiled on a higher version. In my case, it is version 11... and
the code is getting executed on a lower version. In my case it is version 8.
I.e., Java (JDK) compiled code on 11, whereas the JRE version is 8.

Where did I configure JDK 11 and JRE 8?

I am using SpringToolSuite (STS). When I created the project, the JRE System library was in the build path, which got added as the default JRE library version of 8 (1.8). But when I go to the project → Properties → Java Compiler → Compiler Compliance Level, it is by default having a selected version of 11

Solution:

The project → Properties → Java Compiler → Compiler Compliance Level

Set the Compiler Compliance Level to 1.8 That's it. Now you are compiling your code in 1.8 and executing the compiled code with a JRE 1.8.

_{The accepted answer did not resolve the issue, hence I am posting what worked for me.}

score 1 · Answer 19 · edited May 23 '22 at 21:24

1

Just check small step...

javac -version

javac 17

java -version

java version "17" 2021-09-14 LTS

Both javac and java versions are the same. If different, you will get this error.

edited May 23 '22 at 21:24

Peter Mortensen

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answered Oct 03 '21 at 04:28

Rohit Chaurasiya

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What do you mean by *"Just check small step"*? Can you elaborate? – Peter Mortensen May 23 '22 at 21:25

score 0 · Answer 20 · edited May 23 '22 at 00:47

0

Edit the ".classpath" and include the below tag:

<classpathentry kind="con" path="org.testng.TESTNG_CONTAINER"/>

This could solve your problem.

edited May 23 '22 at 00:47

Peter Mortensen

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answered Aug 05 '17 at 05:54

Bheemashankar Pattar

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score 0 · Answer 21 · edited May 23 '22 at 00:53

0

In my project I had changed my Maven POM file and removed the entry for maven-jar-plugin.

When you build a JAR file whose purpose is to be executable, you need to include this so that certain entries get written into the manifest. I opened the old project, copied that entry (with some modifications for project name) and it worked.

edited May 23 '22 at 00:53

Peter Mortensen

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answered Oct 19 '17 at 19:36

Eric Forte

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score 0 · Answer 22 · edited May 23 '22 at 00:55

I think this happens because the name of your class is the same name of another class in the JDK. Help Eclipse to determine which one you are trying to run by selecting the package your class is in. Go to run configuration, select the project and the main class.

When you press the search button to select the main class, you will find options that have the same name but different package, select your class.

Chris C · Answer 23 · 2018-05-29T16:43:59.850

My issue came from trying to disable the Maven nature from my project and then deleting the pom.xml file. This is bad, very bad, don't do this. If you do, change it back to a Maven project and hopefully you can either restore your old pom.xml file or create a new one. As soon as I did that, it worked again.

EDIT: I recently ran across this problem again and this time it was because I had duplicate libraries in my classpath. The one Maven added (which started with /M2_REPO/.... and then one I had added (which I should not have done). Even though Eclipse was reporting that it could not find the class, the actual problem was that I had given it two libraries with the same class and it didn't know which one to use. Once I removed the second reference, it worked.

What do you mean by *"disable the Maven nature"*? – Peter Mortensen May 23 '22 at 00:59 — Peter Mortensen, May 23 '22 at 00:59

score 0 · Answer 24 · edited May 23 '22 at 19:36

There was no information in my console so that sent me searching for additional solutions and found these - unique to the solutions presented here. I encountered this with Eclipse v4.7 (Oxygen) trying to run an old Ant build on a project.

Cause 1

I had configured Eclipse to use an external Ant install which was version 1.10.2 which apparently had classes in it that were compiled with JDK 9. In Eclipse I got the JNI error described above (running the Ant build at the command line gave me the renowned 'unsupported major.minor version' error - the Java I was using on the system was JDK 8).

The solution was to roll back to the embedded Eclipse version of Ant being 1.10.1. I verified this as the correct solution by downloading Ant 1.10.1 separately and reconfiguring Eclipse to use the new 1.10.1 externally and it still worked.

Cause 2

This can also happen when you have the Ant Runtime settings configured incorrectly in Eclipse's Preferences. Depending on the version of Ant you're running you will need to add the tools.jar file from the appropriate JDK to the classpath used for the Ant Runtime (Home Entries). More specifically, without a proper configuration, Eclipse will complain when launching an Ant target that the JRE version is less than a particular required version.

Essentially, 'proper configuration' means aligning each of the configuration items in Eclipse for running Ant so that they all work together. This involves the Ant Runtime Home entry (must point to an Ant version that is compatible with your chosen JDK -- you can't run Ant with JDK 8 when it was compiled against JDK 9); specifying the tools.jar that belongs to the JDK you want to run Ant with in the Ant Runtime settings; and lastly setting the JRE environment of your build script to the JDK you want to run Ant with in the External Tools Configuration.

All three of these settings need to agree to avoid the error described above. You'll also need to consider the attributes used in your javac tag to ensure the JDK you're using is capable of executing as you've directed (i.e., JDK 7 can't compile code using source and target version 8).

Moreover

If you're really just trying to run an Ant build script to compile code to an older JDK (e.g., less than 8 for Oxygen), this article helped gain access to run Ant against an older JDK. There are Ant plugin replacements for a handful of versions of Eclipse, the instructions are brief and getting the correct plugin version for your particular Eclipse is important.

Or more simply you can use this very good solution to do your legacy compile which doesn't require replacing your Eclipse plugin, but instead changing the javac tag in your build script (while using the latest JDK).

score 0 · Answer 25 · edited May 23 '22 at 19:39

0

I have been running into the same error when I adding the following Maven dependency in my project:

<artifactId>aws-encryption-sdk-java</artifactId>

The error came up only when I ran the shade JAR file produced by maven-shade-plugin. I was able to overcome the error by using the JAR file produced by maven-assembly-plugin.

edited May 23 '22 at 19:39

Peter Mortensen

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answered Apr 12 '18 at 16:30

Ioannis Tsiokos

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score 0 · Answer 26 · edited May 23 '22 at 19:41

0

All is not working for me, but once I delete the ".metadata" and ".recommenders" of the workspace, delete the "bin" and "setting" folders, and then after I reimport the same project, then it works for me.

edited May 23 '22 at 19:41

Peter Mortensen

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answered May 07 '18 at 09:50

Shyamjeet Sharma

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What are ".metadata" and ".recommenders"? Files? What wordspace? Eclipse's wordspace? – Peter Mortensen May 23 '22 at 19:42

score 0 · Answer 27 · edited May 23 '22 at 19:43

0

I faced the same issue in NetBeans 8.0.2. Clean and Build Project solved this problem.

edited May 23 '22 at 19:43

Peter Mortensen

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answered Jun 01 '18 at 09:28

Michu93

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What error message did you get? Exactly? – Peter Mortensen May 23 '22 at 19:45
@PeterMortensen, as I wrote - exactly the same as is in question. – Michu93 May 23 '22 at 19:49

score 0 · Answer 28 · answered Jun 24 '18 at 17:32

0

You can try: right click on the project and then click clean. After this run the project.

It works for me.

answered Jun 24 '18 at 17:32

lupin

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score 0 · Answer 29 · edited May 23 '22 at 19:53

The programs which has been written on one version of JDK won't support the JNI platform of another version of the JDK.

If in case we are using JDK 10 and JDK 8 with Eclipse configured for JDK 10 and code written on JDK 10. Now, I don't want to use JDK 10 and started using JDK 8 as jvm and tried to run the code which is written on JDK 10, so Eclipse will threw an error of JNI.

So, to come out of this error, please add the current JVM path to eclipse.ini file. After this, copy the written code to the clipboard. Delete the project in Eclipse, create a new project, check in the copied code, and run.

score 0 · Answer 30 · edited May 31 '22 at 14:11

0

If the problem occurs while launching Ant, check your Ant home: it must point to the same Eclipse folder you are running.

It happened to me while I reinstalled a new Eclipse version and deleted the previous Eclipse folder while keeping the previous Ant home: Ant simply did not find any Java library.

In this case the reason is not a bad JDK version.

edited May 31 '22 at 14:11

Community

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answered Sep 26 '18 at 13:59

ntucci

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The last sentence is incomprehensible. Can you [fix](https://stackoverflow.com/posts/52519542/edit) it? (But ***without*** "Edit:", "Update:", or similar - the answer should appear as if it was written today.) – Peter Mortensen May 23 '22 at 20:05

score 0 · Answer 31 · edited May 23 '22 at 20:13

0

I have faced the same issue due to the packaged name being "Java". After renaming the package, it was no longer throwing an error.

edited May 23 '22 at 20:13

Peter Mortensen

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answered Jan 16 '19 at 06:59

kiran

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score 0 · Answer 32 · edited May 23 '22 at 20:18

In my case, Eclipse was giving me this error, but I was getting classnotfoundexception on javax.servlet.http.HttpServlet in the logs.

In my case, I was trying to start a Spring Boot application with exclude module: 'spring-boot-starter-tomcat' in my build.gradle file (since I'm deploying on WildFly).

The solution was to comment this exclude out. The Eclipse JNI error was very misleading and I would suggest fixing this.

score 0 · Answer 33 · edited May 23 '22 at 20:19

0

I had the same issue. I had imported a newer version of a JSON library (I deleted the old one, but I did not remove it from the build path).

I resolved it by removing the reference to the old one from the build path.

edited May 23 '22 at 20:19

Peter Mortensen

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answered Jul 19 '19 at 08:55

Chris

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score 0 · Answer 34 · edited May 23 '22 at 20:26

0

Using Gradle, the following also worked for me:

Package Explorer → right-click project → Gradle → Refresh Gradle Project.

edited May 23 '22 at 20:26

Peter Mortensen

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answered Sep 30 '19 at 12:37

java-addict301

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score 0 · Answer 35 · edited May 23 '22 at 20:29

0

When we get this error while running our Java application, check if we have some class name or package names starting with ”java.”. If so, change the package name.

This is happening because your package name is colliding with Java system file names.

edited May 23 '22 at 20:29

Peter Mortensen

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answered Oct 21 '20 at 01:42

Chiranjib Patra

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score 0 · Answer 36 · edited May 23 '22 at 21:09

0

This is a core problem. Try javac --version and java --version. You will see a mismatch or inconsistency. Try to set path variables correctly and you will not see any errors.

For Eclipse, right-click on the project → Properties. Then go to project facets and set the JDK to the desired version. Then go to run-times and set JRE to the same version. You should be good.

edited May 23 '22 at 21:09

Peter Mortensen

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answered Mar 06 '21 at 15:31

Chandan Kumar

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score 0 · Answer 37 · edited May 23 '22 at 21:12

0

I'm was trying to run my JAR file (without external JAR files) adding libraries at runtime java -cp "..." -jar myCode.jar, but when you specify -jar then the -cp parameter will be ignored.

So you can include your JAR file in the classpath and then call your main class:

java -cp "myCode.jar:/path/to/jars/*" foo.bar.MyMainClass

Run a JAR file from the command line and specify classpath

edited May 23 '22 at 21:12

Peter Mortensen

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answered Mar 07 '21 at 14:10

Alex

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score 0 · Answer 38 · edited May 23 '22 at 21:22

0

While running Java and JavaFX applications in Eclipse, I have faced the same problem. But I got a simple solution. I have removed JDK 1.8 from the build path and added the same JDK 1.8 to the build path. It works now.

edited May 23 '22 at 21:22

Peter Mortensen

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answered Jun 06 '21 at 16:01

Siddu

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score 0 · Answer 39 · edited May 23 '22 at 21:28

I faced the same problem when I checked-out a project from a Git repository.

To resolve this, I added these properties in the pom.xml file to tell which Java version to use (we are using Java 1.8, but you can use any version number as per your requirement).

<properties>
    <java.version>1.8</java.version>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
</properties>

score 0 · Answer 40 · edited May 23 '22 at 21:29

0

This problem probably occurs because the JDK versions are inconsistent, and the JAR package will have signature files, which do not affect the logic of the program, but they will cause the test demo to fail. Therefore, you need to delete the signature related files in the JAR package.

Delete the .DSA and .SF files under meta-inf in the generated JAR file.

edited May 23 '22 at 21:29

Peter Mortensen

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answered Mar 27 '22 at 14:14

Palmeta

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Kossei Necira · Answer 41 · 2023-04-06T09:44:47.730

0

I run into a similar issue but in the Android SDK command line tool:

Error: A JNI error has occurred, please check your installation and try again in SDK Manager.

Solution: Cheak your JDK version, SDK manager needs JDK 11 at least to work properly.

PS: Remember to update the system variable's path to the new location. If it wasn't there, it would be better if you add it, so you can run SDKManger and other tools directly from the command line.

edited Apr 06 '23 at 09:44

answered Apr 06 '23 at 09:31

Kossei Necira

41
1
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Your answer could be improved with additional supporting information. Please [edit] to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community Apr 11 '23 at 12:14

score -1 · Answer 42 · edited May 23 '22 at 19:47

-1

In NetBeans 8.0.2:

right-click on your package.
Select "Properties".
Go to "Run" option.
Select the main class by browsing your class name.
Click the OK button.

edited May 23 '22 at 19:47

Peter Mortensen

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answered Jun 09 '18 at 06:29

Gihan Wijesuriya

1
1

Error "A JNI error has occurred. Please check your installation and try again in Eclipse x86 Windows 8.1"

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