HTTP Status 500 – Internal Server Error


Type Exception Report

Message Error invoking method 'get(java.lang.Integer)' in java.util.ArrayList at /static/list_library.html[line 27, column 27]

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

org.apache.velocity.exception.VelocityException: Error invoking method 'get(java.lang.Integer)' in java.util.ArrayList at /static/list_library.html[line 27, column 27]
	org.apache.velocity.runtime.parser.node.ASTIndex.execute(ASTIndex.java:175)
	org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:280)
	org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:567)
	org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:71)
	org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:142)
	org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
	org.apache.velocity.runtime.directive.Parse.render(Parse.java:260)
	org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:207)
	org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
	org.apache.velocity.Template.merge(Template.java:356)
	org.apache.velocity.Template.merge(Template.java:260)
	org.apache.velocity.tools.view.VelocityView.performMerge(VelocityView.java:942)
	org.apache.velocity.tools.view.VelocityView.merge(VelocityView.java:902)
	org.apache.velocity.tools.view.VelocityViewServlet.mergeTemplate(VelocityViewServlet.java:318)
	org.apache.velocity.tools.view.VelocityViewServlet.doRequest(VelocityViewServlet.java:220)
	org.apache.velocity.tools.view.VelocityViewServlet.doGet(VelocityViewServlet.java:182)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	com.zwl.http.EncodingFilter.doFilter(EncodingFilter.java)

Root Cause

java.lang.reflect.InvocationTargetException
	sun.reflect.GeneratedMethodAccessor96.invoke(Unknown Source)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	java.lang.reflect.Method.invoke(Method.java:498)
	org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:395)
	org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:384)
	org.apache.velocity.runtime.parser.node.ASTIndex.execute(ASTIndex.java:149)
	org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:280)
	org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:567)
	org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:71)
	org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:142)
	org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
	org.apache.velocity.runtime.directive.Parse.render(Parse.java:260)
	org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:207)
	org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
	org.apache.velocity.Template.merge(Template.java:356)
	org.apache.velocity.Template.merge(Template.java:260)
	org.apache.velocity.tools.view.VelocityView.performMerge(VelocityView.java:942)
	org.apache.velocity.tools.view.VelocityView.merge(VelocityView.java:902)
	org.apache.velocity.tools.view.VelocityViewServlet.mergeTemplate(VelocityViewServlet.java:318)
	org.apache.velocity.tools.view.VelocityViewServlet.doRequest(VelocityViewServlet.java:220)
	org.apache.velocity.tools.view.VelocityViewServlet.doGet(VelocityViewServlet.java:182)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	com.zwl.http.EncodingFilter.doFilter(EncodingFilter.java)

Root Cause

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
	java.util.ArrayList.rangeCheck(ArrayList.java:653)
	java.util.ArrayList.get(ArrayList.java:429)
	sun.reflect.GeneratedMethodAccessor96.invoke(Unknown Source)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	java.lang.reflect.Method.invoke(Method.java:498)
	org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:395)
	org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:384)
	org.apache.velocity.runtime.parser.node.ASTIndex.execute(ASTIndex.java:149)
	org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:280)
	org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:567)
	org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:71)
	org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:142)
	org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
	org.apache.velocity.runtime.directive.Parse.render(Parse.java:260)
	org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:207)
	org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
	org.apache.velocity.Template.merge(Template.java:356)
	org.apache.velocity.Template.merge(Template.java:260)
	org.apache.velocity.tools.view.VelocityView.performMerge(VelocityView.java:942)
	org.apache.velocity.tools.view.VelocityView.merge(VelocityView.java:902)
	org.apache.velocity.tools.view.VelocityViewServlet.mergeTemplate(VelocityViewServlet.java:318)
	org.apache.velocity.tools.view.VelocityViewServlet.doRequest(VelocityViewServlet.java:220)
	org.apache.velocity.tools.view.VelocityViewServlet.doGet(VelocityViewServlet.java:182)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	com.zwl.http.EncodingFilter.doFilter(EncodingFilter.java)

Note The full stack trace of the root cause is available in the server logs.


Apache Tomcat/9.0.0.M18