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From "Christian Wolfgang Stone (JIRA)" <j...@apache.org>
Subject [jira] [Created] (WW-4025) NullPointerException in OgnlTextParser.evaluate().
Date Tue, 26 Mar 2013 02:15:15 GMT
Christian Wolfgang Stone created WW-4025:
--------------------------------------------

             Summary: NullPointerException in OgnlTextParser.evaluate().
                 Key: WW-4025
                 URL: https://issues.apache.org/jira/browse/WW-4025
             Project: Struts 2
          Issue Type: Bug
          Components: Core Interceptors
    Affects Versions: 2.3.14
            Reporter: Christian Wolfgang Stone


In the latest code, lukaszlenart refactored some code.  Using a recent build, I get the following
error (relevant code follows).

java.lang.NullPointerException
	at com.opensymphony.xwork2.util.TextParseUtil$1.evaluate(TextParseUtil.java:161)
	at com.opensymphony.xwork2.util.OgnlTextParser.evaluate(OgnlTextParser.java:50)
	at com.opensymphony.xwork2.util.TextParseUtil.translateVariables(TextParseUtil.java:172)
	at com.opensymphony.xwork2.util.TextParseUtil.translateVariables(TextParseUtil.java:127)
	at com.opensymphony.xwork2.util.TextParseUtil.translateVariables(TextParseUtil.java:71)
	at org.apache.struts2.dispatcher.StrutsResultSupport.conditionalParse(StrutsResultSupport.java:198)
	at org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:185)
	at org.apache.struts2.dispatcher.ServletRedirectResult.execute(ServletRedirectResult.java:161)
	at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:371)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:275)
	at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)

The relevant source code is:
 
+        ParsedValueEvaluator ognlEval = new ParsedValueEvaluator() {
+            public Object evaluate(String parsedValue) {
+                Object o = stack.findValue(parsedValue, asType);
+                if (evaluator != null) {
+                    o = evaluator.evaluate(o.toString());
                 }
+                return o;
             }
-        }

Appears as if there is an assumption that the stack.findValue() will always return a non-null
value.

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