How can I list all Java classes loaded in the JVM?

Finding a List of Classes Loaded in the Java Virtual Machine (JVM)

Determining all the classes loaded in the JVM, including those belonging to a specific package and its descendents, can be challenging. A programmatic approach may not be straightforward.

One alternative method is to use the java -verbose:class command. This command instructs the JVM to provide verbose information about the classes it loads, including the location of the source files.

By running this command, you can obtain a list of all classes that are currently loaded in the JVM. For example, the following output shows the loading of various classes from different JAR files:

[Opened /usr/java/j2sdk1.4.1/jre/lib/rt.jar]
[Opened /usr/java/j2sdk1.4.1/jre/lib/sunrsasign.jar]
[Opened /usr/java/j2sdk1.4.1/jre/lib/jsse.jar]
[Opened /usr/java/j2sdk1.4.1/jre/lib/jce.jar]
[Opened /usr/java/j2sdk1.4.1/jre/lib/charsets.jar]
[Loaded java.lang.Object from /usr/java/j2sdk1.4.1/jre/lib/rt.jar]
[Loaded java.io.Serializable from /usr/java/j2sdk1.4.1/jre/lib/rt.jar]
[Loaded java.lang.Comparable from /usr/java/j2sdk1.4.1/jre/lib/rt.jar]
[Loaded java.lang.CharSequence from /usr/java/j2sdk1.4.1/jre/lib/rt.jar]
[Loaded java.lang.String from /usr/java/j2sdk1.4.1/jre/lib/rt.jar]

By inspecting this verbose output, you can identify the classes that belong to the package of interest and their subclasses. This method provides a comprehensive view of all loaded classes, regardless of whether they have been explicitly loaded through the Java API or loaded automatically by the JVM.

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