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(MS Windows)
Java JAR Archives and classpath

The JVM class loader will only find and use JAR archives that are listed in the classpath. There are several ways to add a JAR to the classpath:

  1. Copy the JAR to one of the directories listed in the CLASSPATH environment variable. To see the current value of the CLASSPATH environment variable, open a MS-DOS prompt and type:
    echo %CLASSPATH%
    Another way of viewing the classpath is to run this Java code:
    String classpath = System.getProperty("java.class.path");
    System.out.println(classpath);
  2. Modify the CLASSPATH environment variable to also include the directory containing the JAR archive. This is typically done via the Windows Computer-->Properties-->Advanced dialog. For more information, these Google searches produce good results: "windows 7 environment variables", "windows xp environment variables", etc.
  3. Set the classpath at runtime. There are several possible ways of doing this:
    1. Use the -classpath option:
      javac -classpath ".;C:/chilkatJava/chilkat.jar" Test.java
      java -classpath ".;C:/chilkatJava/chilkat.jar" Test
    2. Use the -Djava.class.path system property:
      javac -Djava.class.path=.;C:/chilkatJava/chilkat.jar Test.java
      java -Djava.class.path=.;C:/chilkatJava/chilkat.jar Test
    3. Use the CLASSPATH environment variable
      set CLASSPATH=%CLASSPATH%;C:\chilkatJava\chilkat.jar
      javac Test
      java Test

    IMPORTANT:On Windows systems, the semicolon character should be used for the path separator. However, on Linux systems, the colon character should be used.


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