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This exception has no message.
org.eclipse.jdt.internal.compiler.classfmt.ClassFormatException: 	at org.eclipse.jdt.internal.compiler.classfmt.ClassFileReader.(ClassFileReader.java:342)	at org.apache.jasper.compiler.JDTCompiler$1.findType(JDTCompiler.java:206)	at org.apache.jasper.compiler.JDTCompiler$1.findType(JDTCompiler.java:163)	at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.askForType(LookupEnvironment.java:96)	at org.eclipse.jdt.internal.compiler.lookup.UnresolvedReferenceBinding.resolve(UnresolvedReferenceBinding.java:49)	at org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding.resolveType(BinaryTypeBinding.java:97)	at org.eclipse.jdt.internal.compiler.lookup.PackageBinding.getTypeOrPackage(PackageBinding.java:167)	at org.eclipse.jdt.internal.compiler.lookup.Scope.getType(Scope.java:2187)	at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.resolve(TypeDeclaration.java:974)	at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.resolve(TypeDeclaration.java:1164)	at org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration.resolve(CompilationUnitDeclaration.java:366)	at org.eclipse.jdt.internal.compiler.Compiler.process(Compiler.java:623)	at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:392)	at org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:429)	at org.apache.jasper.compiler.Compiler.compile(Compiler.java:349)	at org.apache.jasper.compiler.Compiler.compile(Compiler.java:327)	at org.apache.jasper.compiler.Compiler.compile(Compiler.java:314)	at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:592)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at co.gerger.filters.GZIPFilter.doFilter(GZIPFilter.java:48)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:470)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)	at java.lang.Thread.run(Thread.java:745)