How do I remove a class from a jar file?

How do I remove a class from a jar file?

How to add or remove classes from a JAR file.

1. Backup the jar file you want to modify.
2. unzip the jar file into a directory. unzip xxx.jar -d
3. Go to the directory and add or remove classes.
4. In the directory where MANIFEST. MF exists, recreate the jar file.

How do I get a list of classes in a jar file?

You can use Java jar tool. List the content of jar file in a txt file and you can see all the classes in the jar.

How do I remove all class files?

If you want to permanently remove all class files from you entire history use hg convert and –filemap option to rewrite your repository and get rid of files from all revisions.

How do I package a jar?

To export a project to a JAR file

1. Start Eclipse and navigate to your workspace.
2. In Package Explorer, left-click on the project you want to export.
3. Right-click on the same project and select Export
4. When the Export dialog box pops up, expand Java and click on JAR file.
5. The JAR Export dialog will pop up.
6. Click Finish.

How does maven check unused dependencies?

As others have said, you can use the dependency:analyze goal to find which dependencies are used and declared, used and undeclared, or unused and declared. You may also find dependency:analyze-dep-mgt useful to look for mismatches in your dependencyManagement section.

Can we edit class file?

To modify a class file in an enterprise bean, you change the source code, recompile it, and redeploy the application. For example, if you want to change the exchange rate in the dollarToYen business method of the ConverterBean class, you would follow these steps.

Where is the main method in a jar file?

1. Use eclipse’s build in search function and search for ” main( ” in all projects java files (= entire workspace)
2. Look for the application jar and look at it’s manifest file, it may contain the name of the main class.
3. Look for scripts that are used to start the application.
4. Look for build scripts ( build.

How to remove jars from class path in Java?

Select Project in Project Explorer and Press “Alt+Enter” then Go to Java Build path and select Libraries then select jar file finally click on Remove button.

How to remove unused jars from a Java project?

What is the easiest way (tool ?) to remove unused jars from my java (ant ) project. Our project has become really huge, and we want to do a clean up. There are several jars that are added to the classpath, but not all are used for compile/run.

When do you not need a jar in Java?

As noted by tieTYT in his answer, many jars are needed only at compile time. (for example jdbc implementation jars) Another approach could be to write a java agent and collect all classnames. You can then map these classnames to jar and see if any jars are not needed.

Why do I need a jar to compile Java?

The problem is that even if a jar isn’t needed to compile, it could be needed to run. And this “need” could be transitive. EG: A jar you use needs a jar you don’t use and only at runtime. As is the nature of runtime errors, they’ll only reveal themselves when you try to execute the code.