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From "Hoying, Ken" <Ken_Hoy...@PremierInc.com>
Subject [S2] DEBUG NPE
Date Tue, 18 Mar 2008 12:11:42 GMT
 
I have created a template which utilizes parameters that are passed into
it to generate HTML conditionally based on those parameters.  For
example:

	<s:component theme="scaTheme" templateDir="template"
template="Header.jsp">
		<s:param name="titleKey"
value="%{'title.appNpc'}" />
		<s:param name="helpPage"
value="%{'Non_Premier_Contract_Home_Page.htm'}" />
	</s:component>

However, I do not wish to require that all the parameters be required.
For example, it would be ok if the "helpPage" parameter was not
specified.  At runtime, everything works fine if I do not specify the
"helpPage" parameter.  However if I place my logging level at DEBUG, I
my log is cluttered with NPEs like the one below.  I cannot seem to find
any kind of syntax to reference the parameter to even test if it is null
without generating this NPE in DEBUG.  Does anyone know if it is
possible to avoid these NPEs?  I make heavy use of templates with
optional parameters and it is really cluttering up the logs when trying
to debug.  Am I doing something wrong?  Should this maybe be readdressed
in the Struts code base?  I understand why the DEBUG statement is
logged.  Just not sure since it is a DEBUG statement, if the stack trace
is warranted.

Thanks in advance!


2008-03-14 14:30:14,364 DEBUG (http-127.0.0.1-8080-2:)
[com.opensymphony.xwork2.util.DefaultObjectTypeDeterminer] Error while
retrieving generic property class for property=parameters
java.lang.NullPointerException
	at
com.opensymphony.xwork2.util.GenericsObjectTypeDeterminer.getClass(Gener
icsObjectTypeDeterminer.java:222)
	at
com.opensymphony.xwork2.util.GenericsObjectTypeDeterminer.getKeyClass(Ge
nericsObjectTypeDeterminer.java:44)
	at
com.opensymphony.xwork2.util.XWorkMapPropertyAccessor.getKey(XWorkMapPro
pertyAccessor.java:136)
	at
com.opensymphony.xwork2.util.XWorkMapPropertyAccessor.getProperty(XWorkM
apPropertyAccessor.java:68)
	at ognl.OgnlRuntime.getProperty(OgnlRuntime.java:1643)
	at ognl.ASTProperty.getValueBody(ASTProperty.java:92)
	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:170)
	at ognl.SimpleNode.getValue(SimpleNode.java:210)
	at ognl.ASTChain.getValueBody(ASTChain.java:109)
	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:170)
	at ognl.SimpleNode.getValue(SimpleNode.java:210)
	at ognl.ASTNotEq.getValueBody(ASTNotEq.java:49)
	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:170)
	at ognl.SimpleNode.getValue(SimpleNode.java:210)
	at ognl.ASTAnd.getValueBody(ASTAnd.java:56)
	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:170)
	at ognl.SimpleNode.getValue(SimpleNode.java:210)
	at ognl.Ognl.getValue(Ognl.java:333)
	at
com.opensymphony.xwork2.util.OgnlUtil.getValue(OgnlUtil.java:194)
	at
com.opensymphony.xwork2.util.OgnlValueStack.findValue(OgnlValueStack.jav
a:238)
	at
org.apache.struts2.components.Component.findValue(Component.java:322)
	at org.apache.struts2.components.If.start(If.java:85)
	at
org.apache.struts2.views.jsp.ComponentTagSupport.doStartTag(ComponentTag
Support.java:54)
	at
org.apache.jsp.template.scaTheme.Header_jsp._jspx_meth_s_005fif_005f0(He
ader_jsp.java:273) 



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