java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.sun.tools.javac.jvm.ClassReader.enterClass(ClassReader.java:1740)
at com.sun.tools.javac.jvm.ClassReader.enterClass(ClassReader.java:1755)
at com.sun.tools.javac.code.Symtab.enterClass(Symtab.java:258)
at com.sun.tools.javac.code.Symtab.(Symtab.java:336)
at com.sun.tools.javac.code.Symtab.instance(Symtab.java:45)
at com.sun.tools.javac.jvm.ClassReader.(ClassReader.java:205)
at com.sun.tools.javac.jvm.ClassReader.instance(ClassReader.java:168)
at com.sun.tools.javac.main.JavaCompiler.(JavaCompiler.java:293)
at com.sun.tools.javac.main.JavaCompiler.instance(JavaCompiler.java:72)
at com.sun.tools.javac.main.Main.compile(Main.java:340)
at com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:115)

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