提示:WARN [com.opensymphony.xwork2.ognl.OgnlValueStack] - Error setting value ogn

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本文介绍了一个常见的 Struts2 框架中出现的 OGNL NullPointerException 错误及其解决方法。该错误源于试图获取空对象的属性，通过调整 log4j 的配置级别可以有效避免不必要的警告日志输出。

提示:WARN [com .opensymphony .xwork2 .ognl .OgnlValueStack ] - Error setting value
ognl .OgnlException: source is null for getProperty(null, "book")
        at ognl .OgnlRuntime.getProperty(OgnlRuntime.java:1638)
        at ognl .ASTProperty.getValueBody(ASTProperty.java:92)
        at ognl .SimpleNode.evaluateGetValueBody(SimpleNode.java:170)
        at ognl .SimpleNode.getValue(SimpleNode.java:210)
        at ognl .ASTChain.setValueBody(ASTChain.java:168)
        at ognl .SimpleNode.evaluateSetValueBody(SimpleNode.java:177)
        at ognl .SimpleNode.setValue(SimpleNode.java:246)
        at ognl .Ognl .setValue(Ognl .java:476)
        at com .opensymphony .xwork2 .ognl .OgnlUtil.setValue(OgnlUtil.java:192)
        at com .opensymphony .xwork2 .ognl .OgnlValueStack .setValue(OgnlValueStack .java:155)
        at com .opensymphony .xwork2 .ognl .OgnlValueStack .setValue(OgnlValueStack .java:143)
        at com .opensymphony .xwork2 .interceptor.ParametersInterceptor.setParameters(ParametersInterceptor.java:273)
        at com .opensymphony .xwork2 .interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:187)
        at com .opensymphony .xwork2 .interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
        at com .opensymphony .xwork2 .DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
        at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
        at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:468)
        at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
        at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.
java:76)
        at com .sterning.commons.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:27)
        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.core.StandardHostValve.invoke(StandardHostValve.java:128)
        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:286)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
        at java.lang.Thread.run(Thread.java:619)