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java.lang.ClassFormatError: Welcome (Illegal constant pool type)	at java.lang.ClassLoader.defineClass0(Native Method)	at java.lang.ClassLoader.defineClass(ClassLoader.java:486)	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:111)	at java.net.URLClassLoader.defineClass(URLClassLoader.java:248)	at java.net.URLClassLoader.access$100(URLClassLoader.java:56)	at java.net.URLClassLoader$1.run(URLClassLoader.java:195)	at java.security.AccessController.doPrivileged(Native Method)	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)	at java.lang.ClassLoader.loadClass(ClassLoader.java:297)	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:286)	at java.lang.ClassLoader.loadClass(ClassLoader.java:253)	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:313)