警告: Can't initialize javac processor due to (most likely) a class loader problem: java.lang.NoClassD

说明

主要参考了这位大佬的文章：https://www.cnblogs.com/xxjcai/p/java_compiler.html

不过我是在使用 IDEA 的时候遇到的问题，所以我这里介绍一下在 IDEA 中的解决方案。

错误信息

.\src\main\java\com\xiao\designpattern\dynamicproxy\TimeProxy.java:6: 警告: Can't initialize javac processor due to (most likely) a class loader problem: java.lang.NoClassDefFoundError: com/sun/tools/javac/processing/JavacProcessingEnvironment
class TimeProxy implements Flyable {
^
   at lombok.javac.apt.LombokProcessor.getJavacProcessingEnvironment(LombokProcessor.java:419)
   at lombok.javac.apt.LombokProcessor.init(LombokProcessor.java:90)
   at lombok.core.AnnotationProcessor $J a v a c D e s c r i p t o r . w a n t (A n n o t a t i o n P r o c e s s o r . j a v a : 124) a t l o m b o k . c o r e . A n n o t a t i o n P r o c e s s o r . i n i t (A n n o t a t i o n P r o c e s s o r . j a v a : 177) a t l o m b o k . l a u n c h . A n n o t a t i o n P r o c e s s o r H i d e r$ AnnotationProcessor.init(AnnotationProcessor.java:73)
   at com.sun.tools.javac.processing.JavacProcessingEnvironment $P r o c e s s o r S t a t e . < i n i t > (J a v a c P r o c e s s i n g E n v i r o n m e n t . j a v a : 500) a t c o m . s u n . t o o l s . j a v a c . p r o c e s s i n g . J a v a c P r o c e s s i n g E n v i r o n m e n t$ DiscoveredProcessors $P r o c e s s o r S t a t e I t e r a t o r . n e x t (J a v a c P r o c e s s i n g E n v i r o n m e n t . j a v a : 597) a t c o m . s u n . t o o l s . j a v a c . p r o c e s s i n g . J a v a c P r o c e s s i n g E n v i r o n m e n t . d i s c o v e r A n d R u n P r o c s (J a v a c P r o c e s s i n g E n v i r o n m e n t . j a v a : 690) a t c o m . s u n . t o o l s . j a v a c . p r o c e s s i n g . J a v a c P r o c e s s i n g E n v i r o n m e n t . a c c e s s$ 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.xiao.designpattern.dynamicproxy.JavaCompiler.compiler(JavaCompiler.java:19)
   at com.xiao.designpattern.dynamicproxy.Proxy.newProxyInstance(Proxy.java:62)
   at com.xiao.designpattern.dynamicproxy.Test.main(Test.java:10)
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)
   ... 19 more
1 个警告

解决方案

1、

2、

这里 1.8 版本的 SDK 是我现在项目在用的 SDK，查看右侧的 ClassPath，发现没有 tools.jar，所以第三步就需要添加 tools.jar

3、

4、再次运行程序，程序已经能够正常运行。

java.lang.NoClassDefFoundError: com/sun/tools/javac/processing/JavacProcessingEnvironment

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 $J a v a c D e s c r i p t o r . w a n t (A n n o t a t i o n P r o c e s s o r . j a v a : 124) a t l o m b o k . c o r e . A n n o t a t i o n P r o c e s s o r . i n i t (A n n o t a t i o n P r o c e s s o r . j a v a : 177) a t l o m b o k . l a u n c h . A n n o t a t i o n P r o c e s s o r H i d e r$ AnnotationProcessor.init(AnnotationProcessor.java:73)
   at com.sun.tools.javac.processing.JavacProcessingEnvironment $P r o c e s s o r S t a t e . < i n i t > (J a v a c P r o c e s s i n g E n v i r o n m e n t . j a v a : 500) a t c o m . s u n . t o o l s . j a v a c . p r o c e s s i n g . J a v a c P r o c e s s i n g E n v i r o n m e n t$ DiscoveredProcessors $P r o c e s s o r S t a t e I t e r a t o r . n e x t (J a v a c P r o c e s s i n g E n v i r o n m e n t . j a v a : 597) a t c o m . s u n . t o o l s . j a v a c . p r o c e s s i n g . J a v a c P r o c e s s i n g E n v i r o n m e n t . d i s c o v e r A n d R u n P r o c s (J a v a c P r o c e s s i n g E n v i r o n m e n t . j a v a : 690) a t c o m . s u n . t o o l s . j a v a c . p r o c e s s i n g . J a v a c P r o c e s s i n g E n v i r o n m e n t . a c c e s s$ 1800(JavacProcessingEnvironment.java:91)
   at com.sun.tools.javac.processing.JavacProcessingEnvironment $R o u n d . r u n (J a v a c P r o c e s s i n g E n v i r o n m e n t . j a v a : 1035) a t c o m . s u n . t o o l s . j a v a c . p r o c e s s i n g . J a v a c P r o c e s s i n g E n v i r o n m e n t . d o P r o c e s s i n g (J a v a c P r o c e s s i n g E n v i r o n m e n t . j a v a : 1176) a t c o m . s u n . t o o l s . j a v a c . m a i n . J a v a C o m p i l e r . p r o c e s s A n n o t a t i o n s (J a v a C o m p i l e r . j a v a : 1170) a t c o m . s u n . t o o l s . j a v a c . m a i n . J a v a C o m p i l e r . c o m p i l e (J a v a C o m p i l e r . j a v a : 856) a t c o m . s u n . t o o l s . j a v a c . m a i n . M a i n . c o m p i l e (M a i n . j a v a : 523) a t c o m . s u n . t o o l s . j a v a c . a p i . J a v a c T a s k I m p l . d o C a l l (J a v a c T a s k I m p l . j a v a : 129) a t c o m . s u n . t o o l s . j a v a c . a p i . J a v a c T a s k I m p l . c a l l (J a v a c T a s k I m p l . j a v a : 138) a t c o m . l e e n . s e r v i c e . u t i l . C o m p i l e r U t i l . c o m p i l e (C o m p i l e r U t i l . j a v a : 54) a t c o m . l e e n . s e r v i c e . s e r v i c e . i m p l . D i s G e n e r a t e S e r v i c e I m p l . c o m p l i e (D i s G e n e r a t e S e r v i c e I m p l . j a v a : 137) a t c o m . l . m a i n . l e e n . c o n t r o l l e r . D i s G e n e r a t e C o n t r o l l e r . d i s G e n e r a t e (D i s G e n e r a t e C o n t r o l l e r . j a v a : 43) a t c o m . l . m a i n . l e e n . c o n t r o l l e r . D i s G e n e r a t e C o n t r o l l e r$ $F a s t C l a s s B y S p r i n g C G L I B$ $5 d d 4 a d 53. i n v o k e (< g e n e r a t e d >) a t o r g . s p r i n g f r a m e w o r k . c g l i b . p r o x y . M e t h o d P r o x y . i n v o k e (M e t h o d P r o x y . j a v a : 218) a t o r g . s p r i n g f r a m e w o r k . a o p . f r a m e w o r k . C g l i b A o p P r o x y$ DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:684)
   at com.l.main.leen.controller.DisGenerateController $E n h a n c e r B y S p r i n g C G L I B$ f6c287bb.disGenerate(<generated>)
   at com.l.main.leen.controller.DisGenerateController $F a s t C l a s s B y S p r i n g C G L I B$ 5dd4ad53.invoke(<generated>)
   at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
   at org.springframework.aop.framework.CglibAopProxy $D y n a m i c A d v i s e d I n t e r c e p t o r . i n t e r c e p t (C g l i b A o p P r o x y . j a v a : 684) a t c o m . l . m a i n . l e e n . c o n t r o l l e r . D i s G e n e r a t e C o n t r o l l e r$ $E n h a n c e r B y S p r i n g C G L I B$ $c 2058 c 9 b . d i s G e n e r a t e (< g e n e r a t e d >) a t s u n . r e f l e c t . N a t i v e M e t h o d A c c e s s o r I m p l . i n v o k e 0 (N a t i v e M e t h o d) a t s u n . r e f l e c t . N a t i v e M e t h o d A c c e s s o r I m p l . i n v o k e (N a t i v e M e t h o d A c c e s s o r I m p l . j a v a : 62) a t s u n . r e f l e c t . D e l e g a t i n g M e t h o d A c c e s s o r I m p l . i n v o k e (D e l e g a t i n g M e t h o d A c c e s s o r I m p l . j a v a : 43) a t j a v a . l a n g . r e f l e c t . M e t h o d . i n v o k e (M e t h o d . j a v a : 498) a t o r g . s p r i n g f r a m e w o r k . w e b . m e t h o d . s u p p o r t . I n v o c a b l e H a n d l e r M e t h o d . d o I n v o k e (I n v o c a b l e H a n d l e r M e t h o d . j a v a : 189) a t o r g . s p r i n g f r a m e w o r k . w e b . m e t h o d . s u p p o r t . I n v o c a b l e H a n d l e r M e t h o d . i n v o k e F o r R e q u e s t (I n v o c a b l e H a n d l e r M e t h o d . j a v a : 138) a t o r g . s p r i n g f r a m e w o r k . w e b . s e r v l e t . m v c . m e t h o d . a n n o t a t i o n . S e r v l e t I n v o c a b l e H a n d l e r M e t h o d . i n v o k e A n d H a n d l e (S e r v l e t I n v o c a b l e H a n d l e r M e t h o d . j a v a : 102) a t o r g . s p r i n g f r a m e w o r k . w e b . s e r v l e t . m v c . m e t h o d . a n n o t a t i o n . R e q u e s t M a p p i n g H a n d l e r A d a p t e r . i n v o k e H a n d l e r M e t h o d (R e q u e s t M a p p i n g H a n d l e r A d a p t e r . j a v a : 895) a t o r g . s p r i n g f r a m e w o r k . w e b . s e r v l e t . m v c . m e t h o d . a n n o t a t i o n . R e q u e s t M a p p i n g H a n d l e r A d a p t e r . h a n d l e I n t e r n a l (R e q u e s t M a p p i n g H a n d l e r A d a p t e r . j a v a : 800) a t o r g . s p r i n g f r a m e w o r k . w e b . s e r v l e t . m v c . m e t h o d . A b s t r a c t H a n d l e r M e t h o d A d a p t e r . h a n d l e (A b s t r a c t H a n d l e r M e t h o d A d a p t e r . j a v a : 87) a t o r g . s p r i n g f r a m e w o r k . w e b . s e r v l e t . D i s p a t c h e r S e r v l e t . d o D i s p a t c h (D i s p a t c h e r S e r v l e t . j a v a : 1038) a t o r g . s p r i n g f r a m e w o r k . w e b . s e r v l e t . D i s p a t c h e r S e r v l e t . d o S e r v i c e (D i s p a t c h e r S e r v l e t . j a v a : 942) a t o r g . s p r i n g f r a m e w o r k . w e b . s e r v l e t . F r a m e w o r k S e r v l e t . p r o c e s s R e q u e s t (F r a m e w o r k S e r v l e t . j a v a : 1005) a t o r g . s p r i n g f r a m e w o r k . w e b . s e r v l e t . F r a m e w o r k S e r v l e t . d o P o s t (F r a m e w o r k S e r v l e t . j a v a : 908) a t j a v a x . s e r v l e t . h t t p . H t t p S e r v l e t . s e r v i c e (H t t p S e r v l e t . j a v a : 660) a t o r g . s p r i n g f r a m e w o r k . w e b . s e r v l e t . F r a m e w o r k S e r v l e t . s e r v i c e (F r a m e w o r k S e r v l e t . j a v a : 882) a t j a v a x . s e r v l e t . h t t p . H t t p S e r v l e t . s e r v i c e (H t t p S e r v l e t . j a v a : 741) a t o r g . a p a c h e . c a t a l i n a . c o r e . A p p l i c a t i o n F i l t e r C h a i n . i n t e r n a l D o F i l t e r (A p p l i c a t i o n F i l t e r C h a i n . j a v a : 231) a t o r g . a p a c h e . c a t a l i n a . c o r e . A p p l i c a t i o n F i l t e r C h a i n . d o F i l t e r (A p p l i c a t i o n F i l t e r C h a i n . j a v a : 166) a t o r g . a p a c h e . t o m c a t . w e b s o c k e t . s e r v e r . W s F i l t e r . d o F i l t e r (W s F i l t e r . j a v a : 53) a t o r g . a p a c h e . c a t a l i n a . c o r e . A p p l i c a t i o n F i l t e r C h a i n . i n t e r n a l D o F i l t e r (A p p l i c a t i o n F i l t e r C h a i n . j a v a : 193) a t o r g . a p a c h e . c a t a l i n a . c o r e . A p p l i c a t i o n F i l t e r C h a i n . d o F i l t e r (A p p l i c a t i o n F i l t e r C h a i n . j a v a : 166) a t o r g . a p a c h e . s h i r o . w e b . s e r v l e t . P r o x i e d F i l t e r C h a i n . d o F i l t e r (P r o x i e d F i l t e r C h a i n . j a v a : 61) a t o r g . a p a c h e . s h i r o . w e b . s e r v l e t . A d v i c e F i l t e r . e x e c u t e C h a i n (A d v i c e F i l t e r . j a v a : 108) a t o r g . a p a c h e . s h i r o . w e b . s e r v l e t . A d v i c e F i l t e r . d o F i l t e r I n t e r n a l (A d v i c e F i l t e r . j a v a : 137) a t o r g . a p a c h e . s h i r o . w e b . s e r v l e t . O n c e P e r R e q u e s t F i l t e r . d o F i l t e r (O n c e P e r R e q u e s t F i l t e r . j a v a : 125) a t o r g . a p a c h e . s h i r o . w e b . s e r v l e t . P r o x i e d F i l t e r C h a i n . d o F i l t e r (P r o x i e d F i l t e r C h a i n . j a v a : 66) a t o r g . a p a c h e . s h i r o . w e b . s e r v l e t . A b s t r a c t S h i r o F i l t e r . e x e c u t e C h a i n (A b s t r a c t S h i r o F i l t e r . j a v a : 449) a t o r g . a p a c h e . s h i r o . w e b . s e r v l e t . A b s t r a c t S h i r o F i l t e r$ 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 $C o n n e c t i o n H a n d l e r . p r o c e s s (A b s t r a c t P r o t o c o l . j a v a : 834) a t o r g . a p a c h e . t o m c a t . u t i l . n e t . N i o E n d p o i n t$ 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 $W o r k e r . r u n (T h r e a d P o o l E x e c u t o r . j a v a : 624) a t o r g . a p a c h e . t o m c a t . u t i l . t h r e a d s . T a s k T h r e a d$ 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：