Eclipse issue with Maven build and JDK when generating Qclasses in Querydsl

Question

When I add this code below in my pom.xml to support Querydsl

<plugin>
  <groupId>com.mysema.maven</groupId>
  <artifactId>apt-maven-plugin</artifactId>
  <version>1.0.6</version>
  <executions>
    <execution> 
      <goals>
        <goal>process</goal>
      </goals>
      <configuration>
        <outputDirectory>target/generated-sources/java</outputDirectory>
        <processor>com.mysema.query.apt.jpa.JPAAnnotationProcessor</processor>
      </configuration>
    </execution>
  </executions>
</plugin>

I got this error when building with Eclipse. I think it has relation with classpath and JDK jars

You need to run build with JDK or have tools.jar on the classpath.
If this occures during eclipse build make sure you run eclipse under  JDK as well 
(com.mysema.maven:apt-maven-plugin:1.0.6:process:default:generate-sources)

.classpath :

<?xml version="1.0" encoding="UTF-8"?>
<classpath>
    <classpathentry kind="src" output="target/classes" path="src">
        <attributes>
            <attribute name="optional" value="true"/>
            <attribute name="maven.pomderived" value="true"/>
        </attributes>
    </classpathentry>
    <classpathentry kind="con" path="org.eclipse.jst.server.core.container/org.eclipse.jst.server.tomcat.runtimeTarget/Apache Tomcat v8.0">
        <attributes>
            <attribute name="owner.project.facets" value="jst.web"/>
        </attributes>
    </classpathentry>
    <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7">
        <attributes>
            <attribute name="maven.pomderived" value="true"/>
        </attributes>
    </classpathentry>
    <classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
        <attributes>
            <attribute name="maven.pomderived" value="true"/>
            <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
        </attributes>
    </classpathentry>
    <classpathentry kind="output" path="target/classes"/>
</classpath>

Extra info :

enter image description here

My maven Installation

enter image description here

JAVA_HOME : C:\Program Files\Java\jdk1.7.0_45
PATH : %JAVA_HOME%\bin;

How are you running the Maven build for this project? In eclipse or on the command line? — Donovan Muller, Jun 30 '14 at 06:47
I don't run Maven build i just use eclipse and when i add the code in my question to **pom.xml** i got the error. — Hayi, Jun 30 '14 at 06:52
If you go to `Windows > Preference > Maven > Installations`, what entries do you have there? Also, what does your `.classpath` look like? — Donovan Muller, Jun 30 '14 at 07:00
Is this working when you run it outside Eclipse, or is this an eclipse-only issue? — eis, Jun 30 '14 at 07:15
@Haricha I updated your question accordingly, since this seems to be Eclipse issue, not an issue with Spring or Maven as such — eis, Jun 30 '14 at 10:55

Hayi · Accepted Answer · 2015-03-06T19:20:36.450

47

SOLUTION 1

Following this link

"The Maven APT plugin has a known issue that prevents its usage directly from Eclipse. Eclipse users must create the Querydsl query types manually by running the command mvn generate-sources at command prompt."

So i execute the command line mvn generate-sources in my project floder with console cmd and i got my Qclasses generated.

SOLUTION 2 from @informatik01 comment

we can explicitly specified JVM in the eclipse.ini like that :

-vm
C:\Program Files\Java\jdk1.7.0_45\bin\javaw.exe

-vmargs
...

The -vm option must occur before the -vmargs option and for more info read @informatik01 comment below.

edited Mar 06 '15 at 19:20

answered Jul 01 '14 at 14:53

Hayi

6,972
26
80
139

I've gone to the project directory, I've run mvn generate-sources, I've set the Eclipse JDK version, but in Eclipse I still can't get my Q classes recognized. When I run the project with maven it works, but Eclipse gives me syntax errors in my code when I'm just looking at it. The sources are being generated in target/generate-sources . Is this the problem? – Michael Tontchev Apr 16 '15 at 18:59
You have to add target/generate-sources/querydsl as a source folder. Nothing in the target dir is considered source by default. – Robin Jul 07 '15 at 13:33
@MichaelTontchev http://stackoverflow.com/questions/26833880/including-qclasses-in-the-classpath – Hayi Jul 07 '15 at 17:07
1

Few more pointers:- As solutions 2 didn't work for me initially 1. Make sure eclipse is 64 bit if you are using 64 bit JDK. 2. You might have to do a eclipse clean build after restarting eclipse. – Kaushik Feb 01 '17 at 09:20

score 5 · Answer 2 · edited May 23 '17 at 12:18

5

You could try with this in the pom:

<plugin>
  <groupId>com.mysema.maven</groupId>
  <artifactId>apt-maven-plugin</artifactId>
  <version>1.0.6</version>
  <executions>
    <execution> 
      <goals>
        <goal>process</goal>
      </goals>
      <configuration>
        <outputDirectory>target/generated-sources/java</outputDirectory>
        <processor>com.mysema.query.apt.jpa.JPAAnnotationProcessor</processor>
      </configuration>
    </execution>
  </executions>
  <dependencies>
    <dependency>
      <groupId>com.sun</groupId>
      <artifactId>tools</artifactId>
      <version>1.7</version>
      <scope>system</scope>
      <systemPath>${java.home}/../lib/tools.jar</systemPath>
     </dependency>
  </dependencies>
</plugin>

And see if it changes anything. It should force tools.jar in the build path.

Edit. since that didn't help, try specifying

-vm 
D:/work/Java/jdk1.6.0_13/bin/javaw.exe

in eclipse.ini (separate lines are important), as explained in this thread.

edited May 23 '17 at 12:18

Community

1
1

answered Jun 30 '14 at 11:04

eis

51,991
13
150
199

I try it but still got the same error i think the problem is in `You need to run build with JDK` not in `tools.jar` part – Hayi Jun 30 '14 at 13:58
@Haricha they should be alternatives for each other. You'd need to either run the build with JDK or have tools.jar in the path. However, if that's not working for you, you could still try to tweak Eclipse startup options. That's explained in [this thread](http://stackoverflow.com/questions/905611/how-do-i-set-eclipse-ini-vm-option) – eis Jun 30 '14 at 18:23
did you try the vm option? – eis Jul 01 '14 at 06:15
yes of course, I solve it by generate the source in commande line `mvn generate-sources` – Hayi Jul 01 '14 at 14:50
@eis You are right about your suggestion in your edit. See [my comment](http://stackoverflow.com/questions/24482259/eclipse-issue-with-maven-build-and-jdk-when-generating-qclasses-in-querydsl#comment46070389_24513324) – informatik01 Mar 06 '15 at 18:49
I think with `/` int the path it didn't work with me. now with `\ ` it works – Hayi Apr 14 '15 at 17:08

score 3 · Answer 3 · answered Aug 07 '19 at 15:22

I did it finally! I've tried so many option like this and this, but no luck. Then I read this comment that saved my life, really, thank you! I follow this solution and its working suddenly! should be accepted answer in my case.

I copied tools.jar from C:\Program Files\Java\jdk1.8.0_151\lib to C:\Program Files\Java\jre1.8.0_151\lib, after i execute mvn clean install – @julio mulcue burbano

chenyayi · Answer 4 · 2016-03-05T04:41:26.240

<groupId>com.mysema.maven</groupId>
        <artifactId>maven-apt-plugin</artifactId>
        <version>1.0.6</version>
        <executions>
            <execution>
                <goals>
                    <goal>process</goal>
                </goals>
                <configuration>
                        <outputDirectory>target/generated-sources/java</outputDirectory>
                        <processor>com.mysema.query.apt.jpa.JAPAnnotationProcessor</processor>
                </configuration>
            </execution>
        </executions>
    </plugin>

add the plugin ,you will solve it

score 1 · Answer 5 · edited May 23 '17 at 12:18

1

This issue was happening to me because as mentioned above, Eclipse itself was running through the JRE instead of the JDK.

I solved it by adding %JAVA_HOME%\bin to the front of my PATH environment variable.

I figured out what JVM eclipse was using by reading through: Find out what JVM Eclipse is running on

edited May 23 '17 at 12:18

Community

1
1

answered Aug 24 '16 at 22:23

River

133
1
8

score 0 · Answer 6 · answered Jun 30 '14 at 02:54

0

If you build by shell commond like mvn install. Then run this command in the shell or cmd window: echo $CLASSPATH. This command shows your classpath.

If you are using Eclipse, open Window > Preferences > Java > Installed JREs, make sure your installed JREs are of jdk root location. For me, it is C:\Java\jdk1.7.0_51

Hope it helps.

answered Jun 30 '14 at 02:54

user3313007

1

it didn't work i update my question with extra info. – Hayi Jun 30 '14 at 05:17

score 0 · Answer 7 · answered Jun 30 '14 at 02:55

Try updating the JDK in Eclipse as below:

set the JRE in

look at the path below - having program files(but in your mentioned path it is not having program files in your path , usually java and all programs gets install in program files so make sure that path)

 Window->Preferences...->Java->Installed JREs:

JRE type: Standard VM JRE 
Name: jdk1.6.0_18
JRE home directory: C:\Program Files (x86)\Java\jdk1.6.0_18

alos make sure JAVA_HOME path is set properly to JDK\bin properly(without any spaces and all in that path)

Try copying your JDK to a different location and update your JAVA_HOME with that new location.

let me know for any other issues.

it didn't works, i update my question with extra info. – Hayi Jun 30 '14 at 05:18 — Hayi, Jun 30 '14 at 05:18

score 0 · Answer 8 · answered Dec 28 '15 at 20:36

Don't forget to check the setting of the Execution Environment in in your Eclipse Project Settings: Project Build Path -> Libraries -> JRE System Library.

If this is wrong (e.g. jre), switch this to a jdk one.

In my case, this solved the issue ("You need to run build with JDK or have tools.jar on the classpath." disappeared).

Then the approx. fourth line in the Maven Run Log changes from (e.g.)

...
Java home: C:\Program Files\Java\jre1.8.0_66
....

to

 ...
 Java home: C:\Program Files\Java\jdk1.8.0_66\jre
 ...

Hope this helps.

score 0 · Answer 9 · answered May 18 '18 at 20:39

I had done everything suggested above but to no avail. Finally, because I was setting up a new computer, I realized I didn't have a JAVA_HOME variable set up.

So all I did was to add the JAVA_HOME variable to my system variables and set that to a JDK path: C:\Program Files\Java\jdk1.8.0_172

And voila - mvn generate-resources started working again.

Eclipse issue with Maven build and JDK when generating Qclasses in Querydsl

9 Answers9

Linked