How to Include External JARs in the Classpath for Java Compilation and Annotation Processing?

Including Jars in Classpath for Java Compilation or Annotation Processing (Command Line)

To compile a program that requires dependencies from external jars, it's necessary to include those jars in the classpath. This is especially true when using annotation processing tools like apt.

If you are encountering compile errors indicating missing packages or symbols, it suggests that the required jars are not included in the classpath. To resolve this issue, you can use the -cp (classpath) option in the javac or apt command.

Javac

Add the jars to the classpath using the -cp option:

javac -cp jsr181-api.jar:. HelloImp.java

. (dot) indicates the current directory, which should also be included in the classpath, by default, when not using -cp.

Apt

Similar to javac, use the -cp option to include the jars:

apt -cp jsr181-api.jar:. HelloImp.java

Ant

If you are using Ant, you can set the classpath in the tag:

<project>
  <target name="compile">
    <javac classpath="jsr181-api.jar:.">
      <src path="."/>
    </javac>
  </target>
</project>

Windows

In Windows systems, use ; instead of : to separate the jars in the classpath:

java -cp jsr181-api.jar;. HelloWorld.java

Remember to include the current directory (.) in the classpath to ensure successful compilation.

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