Weird compile error

[DFTBA]

My program previously worked, but now when i press "run file" in jcreator, i get:

Exception in thread "Thread-0" java.lang.ClassFormatError: Truncated class file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader. java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java :615)
at java.security.SecureClassLoader.defineClass(Secure ClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader .java:283)
at java.net.URLClassLoader.access$000(URLClassLoader. java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java: 197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.j ava:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:3 06)
at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:2 47)
at ThinkingClass.run(ThinkingClass.java:20)
at java.lang.Thread.run(Thread.java:662)




Why?

[wsaryada]

Your class files might have been corrupted. Have you tried to recompile all your classes?

[DFTBA]

Many times. Out of habit, I recompile before every time I run. Or in this case, TRY to run.

[DFTBA]

New detail: I have 4 classes. MasterClass, ProgramExitter, ThinkingClass, and Setup. MasterClass sets up a thread for each of the others. ProgramExitter and Setup both make their own JFrame. When I run the MasterClass, the JFrame for ProgramExitter pops up. But the one for Setup does not.