最近项目用到了java程序动态编译java源文件，运行程序一直报错，提示错误如下：

Can't initialize javac processor due to (most likely) a class loader problem: java.lang.NoClassDefFoundError: com/sun/tools/javac/processing/JavacProcessingEnvironment
public class JavaCompilerTest implements Serializable {
       ^
      at lombok.javac.apt.LombokProcessor.getJavacProcessingEnvironment(LombokProcessor.java:411)
      at lombok.javac.apt.LombokProcessor.init(LombokProcessor.java:91)
      at lombok.core.AnnotationProcessor$JavacDescriptor.want(AnnotationProcessor.java:124)
      at lombok.core.AnnotationProcessor.init(AnnotationProcessor.java:177)
      at lombok.launch.AnnotationProcessorHider$AnnotationProcessor.init(AnnotationProcessor.java:73)
      at com.sun.tools.javac.processing.JavacProcessingEnvironment$ProcessorState.<init>(JavacProcessingEnvironment.java:500)
      at com.sun.tools.javac.processing.JavacProcessingEnvironment$DiscoveredProcessors$ProcessorStateIterator.next(JavacProcessingEnvironment.java:597)
      at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:690)
      at com.sun.tools.javac.processing.JavacProcessingEnvironment.access$1800(JavacProcessingEnvironment.java:91)
      at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1035)
      at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1176)
      at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1170)
      at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:856)
      at com.sun.tools.javac.main.Main.compile(Main.java:523)
      at com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:129)
      at com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:138)
      at com.leen.service.util.CompilerUtil.compile(CompilerUtil.java:54)
      at com.leen.service.service.impl.DisGenerateServiceImpl.complie(DisGenerateServiceImpl.java:137)
      at com.l.main.leen.controller.DisGenerateController.disGenerate(DisGenerateController.java:43)
      at com.l.main.leen.controller.DisGenerateController$$FastClassBySpringCGLIB$$5dd4ad53.invoke(<generated>)
      at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
      at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:684)
      at com.l.main.leen.controller.DisGenerateController$$EnhancerBySpringCGLIB$$f6c287bb.disGenerate(<generated>)
      at com.l.main.leen.controller.DisGenerateController$$FastClassBySpringCGLIB$$5dd4ad53.invoke(<generated>)
      at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
      at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:684)
      at com.l.main.leen.controller.DisGenerateController$$EnhancerBySpringCGLIB$$c2058c9b.disGenerate(<generated>)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:498)
      at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:189)
      at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
      at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)
      at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)
      at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:800)
      at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
      at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1038)
      at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)
      at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005)
      at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:908)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
      at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
      at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
      at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)
      at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
      at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
      at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
      at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
      at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
      at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
      at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
      at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
      at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)
      at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
      at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
      at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
      at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
      at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
      at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
      at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
      at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
      at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92)
      at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
      at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)
      at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
      at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
      at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
      at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
      at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
      at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
      at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)
      at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1417)
      at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
      at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
      at java.lang.Thread.run(Thread.java:748)
  Caused by: java.lang.ClassNotFoundException: com.sun.tools.javac.processing.JavacProcessingEnvironment
      at java.lang.ClassLoader.findClass(ClassLoader.java:530)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
      at lombok.launch.ShadowClassLoader.loadClass(ShadowClassLoader.java:530)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
      ... 103 more
1 个警告

看到这个错误，基本能确定是com.sun.tools无法加载，看了下jdk目录lib中有tools.jar这个jar包，比较纳闷。经过网上查类似问题，有人说是加载jre中lib下的tools，果然我的jre没有这个jar包。于是拷贝了一个放到jre下，还是没有解决。最后发现是classpath下没有tools.jar配置。

可通过如下方式加入：

找到jre下lib中的tools.jar，点击apply，OK。重新运行，问题已解决。

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