type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: Unable to compile class for JSP: 

An error occurred at line: 1 in the generated java file
The type java.io.ObjectInputStream cannot be resolved. It is indirectly referenced from required .class files

Stacktrace:
	org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92)
	org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
	org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:443)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:362)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:327)
	org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:594)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:314)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

note The full stack trace of the root cause is available in the Apache Tomcat/7.0.0 logs.

控制台报错信息

org.eclipse.jdt.internal.compiler.classfmt.ClassFormatException
 at org.eclipse.jdt.internal.compiler.classfmt.ClassFileReader.<init>(ClassFileReader.java:372)
 at org.apache.jasper.compiler.JDTCompiler$1.findType(JDTCompiler.java:209)
 at org.apache.jasper.compiler.JDTCompiler$1.findType(JDTCompiler.java:166)
 at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.askForType(LookupEnvironment.java:102)
 at org.eclipse.jdt.internal.compiler.lookup.UnresolvedReferenceBinding.resolve(UnresolvedReferenceBinding.java:49)
 at org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding.resolveType(BinaryTypeBinding.java:122)
 at org.eclipse.jdt.internal.compiler.lookup.PackageBinding.getTypeOrPackage(PackageBinding.java:168)
 at org.eclipse.jdt.internal.compiler.lookup.Scope.getType(Scope.java:2376)
 at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.resolve(TypeDeclaration.java:1004)
 at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.resolve(TypeDeclaration.java:1219)
 at org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration.resolve(CompilationUnitDeclaration.java:528)
 at org.eclipse.jdt.internal.compiler.Compiler.process(Compiler.java:759)
 at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:464)
 at org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:433)
 at org.apache.jasper.compiler.Compiler.compile(Compiler.java:362)
 at org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
 at org.apache.jasper.compiler.Compiler.compile(Compiler.java:327)
 at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:594)
 at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:314)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:201)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:163)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:108)
 at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:556)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:402)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:249)
 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:267)
 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:245)
 at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:260)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
 at java.lang.Thread.run(Thread.java:745)

之前是一直可以用的，突然有一天就不能用了，我是个初学者也找不到原因

是配置文件问题还是什么情况，求大神赐教；