Access exception.class.name in spring:message tag when using SimpleMappingExceptionResolver

Question

In several previous projects (all pre-Spring 3.0), I had a single error handling jsp file (usually "message.jsp") that had a line similar to the following:

<spring:message code="exceptions.${exception.class.name}" text="${exception.message}"/>

This allowed me to map exceptions to this page and resolve certain localized error messages based on the exception type by defining a derivative of the SimpleMappingExceptionResolver:

<bean id="exceptionMapping" class="mycode.ui.resolvers.MyExceptionResolver">
  <property name="exceptionMappings">
    <props>
      <prop key="java.lang.Exception">message</prop>
      <prop key="javax.servlet.ServletException">message</prop>
      <prop key="MyCustomException">message</prop>
      <prop key="ApplicationAuthorizationException">login</prop>
      <prop key="NotLoggedInException">login</prop>
    </props>
  </property>
</bean>

This worked flawlessly until I tried upgrading to Spring 3 and Tomcat 7. Now, when I use this code, I get the following error:

"${exception.class.name}" contains invalid expression(s): javax.el.ELException: The identifier [class] is not a valid Java identifier as required by section 1.19 of the EL specification

Any idea what's changed or how to access the class name of the exception (part of the model returned by Spring to the mapped error page)?

BalusC · Accepted Answer · 2011-06-06 23:07:56Z

18

The EL implementation in Tomcat 7 has indeed been changed to disallow Java keyword literals such as class, new, static etcetera as EL properties.

The only solution as far is to access them using the brace notation instead:

${exception['class'].name}

2 Comments

pconrey Over a year ago

I think I've figured out that just using "exception" does the same thing. Thank you!

166_MMX Over a year ago

To find occurrences you can use this RegEx: (\$\{)(.*?)(?<![(?:"|'))\.(abstract|assert|boolean|break|byte|case|catch|char|class|const|continue|default|do|double|else|enum|extends|final|finally|float|for|goto|if|implements|import|instanceof|int|interface|long|native|new|package|private|protected|public|return|short|static|strictfp|super|switch|synchronized|this|throw|throws|transient|try|void|volatile|while)\b(?!(?:"|')])(.*?)(\})

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