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target is null for method size
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java.lang.NullPointerException: target is null for method size	at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1327)	at ognl.ASTMethod.getValueBody(ASTMethod.java:90)	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)	at ognl.SimpleNode.getValue(SimpleNode.java:258)	at ognl.ASTChain.getValueBody(ASTChain.java:141)	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)	at ognl.SimpleNode.getValue(SimpleNode.java:258)	at ognl.ASTGreater.getValueBody(ASTGreater.java:50)	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)	at ognl.SimpleNode.getValue(SimpleNode.java:258)	at ognl.Ognl.getValue(Ognl.java:494)	at com.opensymphony.xwork2.ognl.OgnlUtil.getValue(OgnlUtil.java:206)	at com.opensymphony.xwork2.ognl.OgnlValueStack.findValue(OgnlValueStack.java:276)	at org.apache.struts2.components.Component.findValue(Component.java:382)	at org.apache.struts2.components.If.start(If.java:86)	at org.apache.struts2.views.jsp.ComponentTagSupport.doStartTag(ComponentTagSupport.java:53)	at org.apache.jsp.pages.customer_jsp._jspx_meth_s_005fif_005f0(customer_jsp.java:222)	at org.apache.jsp.pages.customer_jsp._jspService(customer_jsp.java:87)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:371)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:308)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:259)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:88)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:879)	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)	at java.lang.Thread.run(Thread.java:662)