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java.lang.ClassFormatError: DateTrial (Illegal constant pool type) at java.lang.ClassLoader.defineClass0(Native Method) at java.lang.ClassLoader.defineClass( at at at$100( at$ at Method) at at java.lang.ClassLoader.loadClass( at sun.misc.Launcher$AppClassLoader.loadClass( at java.lang.ClassLoader.loadClass( at java.lang.ClassLoader.loadClassInternal(