Com Opensymphony Xwork2 Ognl Ognlvaluestack Error
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Unexpected Exception Caught Setting On Class Error Setting Expression With Value
us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up unexpected exception caught setting '_' on 'class Struts 2.3 Upgrading OGNL Issue up vote 4 down vote favorite 1 I have a website which was originally built using Struts 2.0. I am now upgrading it to Struts 2.3. This website has include files that perform an AJAX request (searching for inventory based on a common search form). The AJAX request submits the entire form to the searchInventory action. This worked fine in Struts 2.0, but in 2.3 I get exceptions in the error log which look like this: [STDOUT] WARN [com.opensymphony.xwork2.ognl.OgnlValueStack] - CommonsLogger.warn(60) | Error setting expression 'nonInventoryRelatedField' with value '[Ljava.lang.String;@833d35' ognl.OgnlException: target is null for setProperty(null, "9", [Ljava.lang.String;@833d35) at ognl.OgnlRuntime.setProperty(OgnlRuntime.java:2309) at ognl.ASTProperty.setValueBody(ASTProperty.java:127) at ognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:220) at ognl.SimpleNode.setValue(SimpleNode.java:301) at ognl.ASTChain.setValueBody(ASTChain.java:227) at ognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:220) at ognl.SimpleNode.setValue(SimpleNode.java:301) at ognl.Ognl.setValue(Ognl.java:737) at com.opensymphony.xwork2.ognl.OgnlUtil.setValue(OgnlUtil.java:217) at com.opensymphony.xwork2.ognl.OgnlValueStack.trySetValue(OgnlValueStack.java:186) at com.opensymphony.xwork2.ognl.OgnlValueStac
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all parameters from {@link ActionContext#getParameters()} and sets them on the value stack bycalling ValueStack#setValue(String, Object), typically resulting in the values submitted in a https://struts.apache.org/docs/parameters-interceptor.html formrequest being applied to an action in the value stack. Note that the parameter map must contain a String key andoften containers a String[] for the value.The interceptor takes one parameter named 'ordered'. When set to true action properties are guaranteed to beset top-down which means that top action's properties are set first. Then error setting it's subcomponents properties are set.The reason for this order is to enable a 'factory' pattern. For example, let's assume that one has an actionthat contains a property named modelClassthat allows to choose what is the underlying implementation of model.By assuring that modelClassproperty is set before any model properties are set, it's possible to choose modelimplementation error setting expression during action.setModelClass()call. Similarly it's possible to use action.setPrimaryKey()property set call to actually load the model class from persistent storage. Without any assumption on parameterorder you have to use patterns like Preparable Interface.Because parameter names are effectively OGNL statements, it is important that security be taken in to account.This interceptor will not apply any values in the parameters map if the expression contains an assignment (=),multiple expressions (,), or references any objects in the context (#). This is all done in the #acceptableName(String)method. In addition to this method, if the action being invoked implements theParameterNameAwareinterface, the action will be consulted to determine if the parameter should be set.In addition to these restrictions, a flag ( ReflectionContextState#DENY_METHOD_EXECUTION) is set such thatno methods are allowed to be invoked. That means that any expression such as person.doSomething()orperson.getName()will be explicitly forbidden. This is needed to make sure that your application is notexposed to attacks by malicious users.While this interceptor is being invoked, a flag ( ReflectionContextState#CRE