Project throwing IOException (File Not Found) when jar is run

Question

I've made a project in java, using Eclipse.

Here is the project structure:

When I'm running the project in Eclipse as a java application, it runs perfectly fine.

Now, I need to export it as a jar. So, I created the jar using the method described in 3rd answer on this link (answered by Fever):

Failing to run jar file from command line: “no main manifest attribute”

Here is the output of jar tf EventLogger.jar:

META-INF/MANIFEST.MF
com/
com/project/
com/project/eventLogger/
com/project/eventLogger/KafkaConsumerGroup.class
com/project/eventLogger/KafkaProducer.class
com/project/eventLogger/ConsumeConfig.class
com/project/eventLogger/ConsumerThread.class
com/project/eventLogger/Formatter.class
com/project/eventLogger/Execute.class
com/project/eventLogger/Config.class
com/project/eventLogger/package-info.class
com/project/eventLogger/ProdConfig.class
com/project/eventLogger/FormatConfig.class
resources/
resources/Config.properties
resources/ConsumerConfig.properties
resources/FormatterConfig.properties
resources/ProducerConfig.properties
resources/log4j.properties

Here is the manifest file:

Manifest-Version: 1.0
Built-By: vishrant
Class-Path: lib/json-simple-1.1.1.jar lib/junit-4.10.jar lib/hamcrest-
 core-1.1.jar lib/kafka_2.9.2-0.8.2.2.jar lib/jopt-simple-3.2.jar lib/
 kafka-clients-0.8.2.2.jar lib/log4j-1.2.16.jar lib/lz4-1.2.0.jar lib/
 metrics-core-2.2.0.jar lib/slf4j-api-1.7.6.jar lib/snappy-java-1.1.1.
 7.jar lib/slf4j-log4j12-1.6.1.jar lib/zkclient-0.3.jar lib/zookeeper-
 3.4.6.jar lib/jline-0.9.94.jar lib/netty-3.7.0.Final.jar lib/scala-li
 brary-2.9.2-RC3.jar
Build-Jdk: 1.8.0_74
Created-By: Maven Integration for Eclipse
Main-Class: com.project.eventLogger.Execute

and, here is the exception:

java.io.FileNotFoundException: ConsumerConfig.properties (No such file or directory)
    at java.io.FileInputStream.open0(Native Method)
    at java.io.FileInputStream.open(FileInputStream.java:195)
    at java.io.FileInputStream.<init>(FileInputStream.java:138)
    at java.io.FileInputStream.<init>(FileInputStream.java:93)
    at com.project.eventLogger.ConsumeConfig.loadPropertiesFile(ConsumeConfig.java:34)
    at com.project.eventLogger.ConsumeConfig.<clinit>(ConsumeConfig.java:42)
    at com.project.eventLogger.Execute.main(Execute.java:18)
Exception in thread "main" java.lang.ExceptionInInitializerError
    at com.project.eventLogger.Execute.main(Execute.java:18)
Caused by: java.lang.NullPointerException
    at com.project.eventLogger.ConsumeConfig.<clinit>(ConsumeConfig.java:47)
    ... 1 more

Seeing the exception, it is clear that it is not able to load ConsumerConfig.properties which is being done in ConsumeConfig.java.

Here is ConsumeConfig.java:

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Properties;

/**
 * @author vishrant
 *
 */
public class ConsumeConfig {

    public static String zookeeper;
    public static String balance;
    public static String bootstrap_servers;
    public static String zk_session_to;
    public static String zk_sync;
    public static String auto_commit;
    public static String[] topics;
    private static String kafka_bin;
    private static final String PROPERTIES_FILE_PATH = "src/main/resources/ConsumerConfig.properties";

    private static Properties loadPropertiesFile() throws IOException {
        Properties properties = new Properties();
        InputStream in = new FileInputStream(PROPERTIES_FILE_PATH);
        properties.load(in);
        return properties;
    }

    static {
        Properties property = null;
        try {
            property = loadPropertiesFile();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        zookeeper = property.getProperty("ZOOKEEPER");
        balance = property.getProperty("BALANCE");
        bootstrap_servers = property.getProperty("BOOTSTRAP_SERVERS");
        zk_session_to = property.getProperty("ZK_SESSION_TO");
        zk_sync = property.getProperty("ZK_SYNC_TIME");
        auto_commit = property.getProperty("AUTO_COMMIT_INTERVAL");
        topics = property.getProperty("CONSUMER_TOPICS").split(",");
        kafka_bin = property.getProperty("KAFKA_BIN_PATH");
    }
}

Can someone tell me what is the problem and how to resolve this?

This runs perfectly well when run in Eclipse itself.

EDIT1:

Now, the exception is:

Exception in thread "main" java.lang.ExceptionInInitializerError
    at com.project.eventLogger.Execute.main(Execute.java:18)
Caused by: java.lang.NullPointerException
    at java.util.Properties$LineReader.readLine(Properties.java:434)
    at java.util.Properties.load0(Properties.java:353)
    at java.util.Properties.load(Properties.java:341)
    at com.project.eventLogger.ConsumeConfig.loadPropertiesFile(ConsumeConfig.java:35)
    at com.project.eventLogger.ConsumeConfig.<clinit>       (ConsumeConfig.java:42)
    ... 1 more

line no 35:

props.load(resourceStream);

This is the code now:

private static final String PROPERTIES_FILE_PATH = "ConsumerConfig.properties";

private static Properties loadPropertiesFile() throws IOException {
    ClassLoader loader = Thread.currentThread().getContextClassLoader();
    Properties props = new Properties();
    InputStream resourceStream = loader.getResourceAsStream(PROPERTIES_FILE_PATH);
    props.load(resourceStream);
    return props;
}

Objects in a jar are **not** files and you can't use File based APIs (such as `FileInputStream`) to access them. Look at `Class.getResourceAsStream`. — greg-449, Mar 14 '16 at 08:54
Now You may copy paste the Method this should work. Otherwise there must be any configuration problem or `Resources` Folder is not available at his place. — Vikrant Kashyap, Mar 14 '16 at 09:41
Yeas... @VikrantKashyap, that was indeed the problem. I changed the path to `resources/ConsumerConfig.properties` and it worked. — vish4071, Mar 14 '16 at 09:45
Can you tell, why this problem is there. How should I make the jar so that structure is good. — vish4071, Mar 14 '16 at 09:45

score 1 · Answer 1 · answered Mar 14 '16 at 09:35

1

I see the following problems to be the cause:

The jar file is not created correctly for a maven project because the directory resources will normally be not copied to the target directory as is, i.e., instead of

resources/Config.properties

it should look like without the resources directory:

Config.properties

directly under the root directory of the jar file.

The second point is you are using the following in your code

private static final String PROPERTIES_FILE_PATH = "src/main/resources/ConsumerConfig.properties";

This path will not be seen outside of your IDE (in this case Eclipse) because src/main/resources should not exist in the jar file as you could see in the list of your jar file.

The last point is, you should use getResourceAsStream() of the class loader as Vikrant Kashyap already pointed.

answered Mar 14 '16 at 09:35

ujulu

3,289
2
11
14

Thanks for pointing out the problem in structure of my jar. I changed the path in the code from `ConsumerConfig.properties` to `resources/ConsumerConfig.properties` and it works just fine. – vish4071 Mar 14 '16 at 09:43
Can you tell, why this problem is there. How should I make the jar so that structure is good. – vish4071 Mar 14 '16 at 09:44
1

You should just use **mvn package** and the jar file will be created under the target directoy. – ujulu Mar 14 '16 at 10:05
Still one point: you can create the jar file also from within Eclipse: right click on the pom.xml file and click on **Run As > Maven install**, and the correct jar file will be created in the **target* directory. – ujulu Mar 14 '16 at 10:21
Thanks. The 1st one worked great. (Didn't try second) – vish4071 Mar 14 '16 at 14:48

score 0 · Accepted Answer · edited Jun 30 '20 at 04:00

0

try this

// Change Your File Path First.
private static final String PROPERTIES_FILE_PATH = "ConsumerConfig.properties";

private static Properties loadPropertiesFile() throws IOException {
    Properties properties = new Properties();

    // First way to load ResourceAsStream.
    // ClassLoader loader = Thread.currentThread().getContextClassLoader();
    // InputStream resourceStream = loader.getResourceAsStream(PROPERTIES_FILE_PATH);
    // Second way to load ResourceAsStream.
    InputStream resourceStream = ConsumeConfig.class.getResourceAsStream(PROPERTIES_FILE_PATH);
    properties.load(resourceStream);
    return properties;
}

edited Jun 30 '20 at 04:00

toku-sa-n

798
1
8
27

answered Mar 14 '16 at 09:00

Vikrant Kashyap

6,398
3
32
52

resourceName should be path or just the name? – vish4071 Mar 14 '16 at 09:04
It should only a File Name not the absolute path because in Maven Resource Folder is just a dummy Folder . It will not present in War File if we deployed as a `war` – Vikrant Kashyap Mar 14 '16 at 09:08
Replace Your Method with this .. you will not getting error probably – Vikrant Kashyap Mar 14 '16 at 09:16
Yeah...I did all that. I tried this is a separate project earlier which was not maven...maybe that is why it was not working. – vish4071 Mar 14 '16 at 09:21
Now, in this project, I've edited all and it works a charm when run form Eclipse. But again, when I create the jar, it gives a new (NullPointer) Exception, on the same line. – vish4071 Mar 14 '16 at 09:22
now FileNotFound is Gone.then problem with some other code. Your File is not Present. I think there is problem with Property keys which will not be found in File this might a reason for your `NULL Pointer Exception` – Vikrant Kashyap Mar 14 '16 at 09:24
Please see the Edited post. File is there and it works good in Eclipse, but not when I create jar. – vish4071 Mar 14 '16 at 09:30
I have added a new line in my answer. Now replace your function and try once again.. add this line `ClassLoader loader = Thread.currentThread().getContextClassLoader();` – Vikrant Kashyap Mar 14 '16 at 09:33
Thanks. I've got the error. Please revert your latest edit. Previous one works fine. – vish4071 Mar 14 '16 at 09:41
This code will also works fine. There are two ways to do that I have mentioning the second one too @vish4071 – Vikrant Kashyap Mar 14 '16 at 09:43
Yeah...I know. I said that because previous one was generic. No problem anyway. Thanks. – vish4071 Mar 14 '16 at 09:46
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/106216/discussion-between-vikrant-kashyap-and-vish4071). – Vikrant Kashyap Mar 14 '16 at 09:47

Project throwing IOException (File Not Found) when jar is run

2 Answers2