java.lang.AbstractMethodError: javax.xml.transform.TransformerFactory
java.lang.AbstractMethodError: javax.xml.transform.TransformerFactory
- 1、环境及报错场景
- 2、报错数据
- 3、问题分析
- 4、解决
- 5、补充说明
1、环境及报错场景
- jdk 1.7
- idea
- maven
- html 转 pdf 时，报错
2、报错数据
2020-02-24 12:02:59.312 ERROR 9612 --- [nio-8080-exec-9] o.a.c.c.C.[.[.[.[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [/ebid] threw exception [Handler dispatch failed; nested exception is java.lang.AbstractMethodError: javax.xml.transform.TransformerFactory.setFeature(Ljava/lang/String;Z)V] with root cause
java.lang.AbstractMethodError: javax.xml.transform.TransformerFactory.setFeature(Ljava/lang/String;Z)V
at org.xhtmlrenderer.resource.XMLResource$IdentityTransformerPool.<init>(XMLResource.java:388)
at org.xhtmlrenderer.resource.XMLResource$IdentityTransformerPool.<init>(XMLResource.java:396)
at org.xhtmlrenderer.resource.XMLResource$XMLResourceBuilder.<init>(XMLResource.java:173)
at org.xhtmlrenderer.resource.XMLResource$XMLResourceBuilder.<init>(XMLResource.java:170)
at org.xhtmlrenderer.resource.XMLResource.<clinit>(XMLResource.java:67)
at org.xhtmlrenderer.pdf.ITextRenderer.setDocumentFromString(ITextRenderer.java:171)
at org.xhtmlrenderer.pdf.ITextRenderer.setDocumentFromString(ITextRenderer.java:166)
at com.huajie.ebidtender.controller.pm.EtContractController.createPdf(EtContractController.java:463)
at com.huajie.ebidtender.controller.pm.EtContractController$$FastClassBySpringCGLIB$$e90c054f.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:749)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:56)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.adapter.AfterReturningAdviceInterceptor.invoke(AfterReturningAdviceInterceptor.java:55)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:93)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688)
at com.huajie.ebidtender.controller.pm.EtContractController$$EnhancerBySpringCGLIB$$155cf42c.createPdf(<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:665)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:750)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.huajie.ebidtender.filter.AuthFilter.doFilter(AuthFilter.java:215)
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)
//System.setProperty("javax.xml.transform.TransformerFactory", "com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl");
3、问题分析
报错信息分析：
2020-02-24 12:02:59.312 ERROR 9612 --- [nio-8080-exec-9] o.a.c.c.C.[.[.[.[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [/ebid] threw exception [Handler dispatch failed; nested exception is java.lang.AbstractMethodError: javax.xml.transform.TransformerFactory.setFeature(Ljava/lang/String;Z)V] with root cause
java.lang.AbstractMethodError: javax.xml.transform.TransformerFactory.setFeature(Ljava/lang/String;Z)V
at org.xhtmlrenderer.resource.XMLResource$IdentityTransformerPool.<init>(XMLResource.java:388)
at org.xhtmlrenderer.resource.XMLResource$IdentityTransformerPool.<init>(XMLResource.java:396)
at org.xhtmlrenderer.resource.XMLResource$XMLResourceBuilder.<init>(XMLResource.java:173)
at org.xhtmlrenderer.resource.XMLResource$XMLResourceBuilder.<init>(XMLResource.java:170)
at org.xhtmlrenderer.resource.XMLResource.<clinit>(XMLResource.java:67)
at org.xhtmlrenderer.pdf.ITextRenderer.setDocumentFromString(ITextRenderer.java:171)
at org.xhtmlrenderer.pdf.ITextRenderer.setDocumentFromString(ITextRenderer.java:166)
at com.huajie.ebidtender.controller.pm.EtContractController.createPdf(EtContractController.java:463)
对于 java.lang.AbstractMethodError 这种报错，根据经验首先怀疑 jar 直接引用或间接引用有冲突。
关于 AbstractMethodError 的分析，详细可参考博主文章 Java AbstractMethodError 原因分析.
这里是 org.xhtmlrenderer.resource.XMLResource 初始化失败，根据经验是间接引用的 jar冲突,导致多个 jar 中都有 javax.xml.transform.TransformerFactory 的路径，但是可能版本存在差异，没有javax.xml.transform.TransformerFactory.setFeature（） 方法。
由于项目pom文件中引用太多jar,找jar的引用冲突太复杂，尝试找了一下，还是放弃了，哈哈。
于是偷懒，利用 Java中System.setProperty() 和 System.getProperty() 方法来尝试解决一下。
于是在项目报错处添加以下代码 :
System.out.println(System.getProperty("javax.xml.transform.TransformerFactory"));
调用，然后打印出如下结果，发现返回为null；
这个结果就很好说了，对象的都为空，肯定在调用对象的函数会报错。
4、解决
解决方案很简单粗暴，直接用 Java中System.setProperty() 方法，指定成为系统的全局变量！
在调用的前一句添加代码：
System.setProperty("javax.xml.transform.TransformerFactory", "com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl");
5、补充说明
Java 中 System.setProperty() 用法
- 设置指定键对值的系统属性
- setProperty (String prop, String value);
- 参数：
- prop - 系统属性的名称。
- value - 系统属性的值。
- 返回：
- 系统属性以前的值，如果没有以前的值，则返回 null。
- 抛出：
- SecurityException - 如果安全管理器存在并且其 checkPermission 方法不允许设置指定属性。
- NullPointerException - 如果 key 或 value 为 null。
- IllegalArgumentException - 如果 key 为空。
- 注：这里的system，系统指的是 JRE (runtime)system，不是指 OS。
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