Invalid expression evaluators are not detected in DefaultExpressionManager

• User impact:

  Low
• Configuration:

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  <?xml version="1.0" encoding="UTF-8"?>
  <mule xmlns="http://www.mulesoft.org/schema/mule/core"
  xmlns:http="http://www.mulesoft.org/schema/mule/http"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:test="http://www.mulesoft.org/schema/mule/test"
  xsi:schemaLocation="
  http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
  http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
  http://www.mulesoft.org/schema/mule/test http://www.mulesoft.org/schema/mule/test/current/mule-test.xsd">

  <flow name="test">
  <http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="7777"/>
  <test:component throwException="true" exceptionToThrow="java.lang.RuntimeException"/>

  <choice-exception-strategy>
  <catch-exception-strategy when="foo:expression">
  <logger message="RUNTIME EXCEPTION"/>
  </catch-exception-strategy>
  </choice-exception-strategy>
  </flow>
  </mule>

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  <?xml version="1.0" encoding="UTF-8"?> <mule xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:test="http://www.mulesoft.org/schema/mule/test" xsi:schemaLocation=" http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd http://www.mulesoft.org/schema/mule/test http://www.mulesoft.org/schema/mule/test/current/mule-test.xsd"> <flow name="test"> <http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="7777"/> <test:component throwException="true" exceptionToThrow="java.lang.RuntimeException"/> <choice-exception-strategy> <catch-exception-strategy when="foo:expression"> <logger message="RUNTIME EXCEPTION"/> </catch-exception-strategy> </choice-exception-strategy> </flow> </mule>
• Log Output:

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  [04-23 20:52:12] ERROR DefaultSystemExceptionStrategy [connector.http.mule.default.receiver.02]:
  ********************************************************************************
  Message : Execution of the expression "foo:expression" failed. (org.mule.api.expression.ExpressionRuntimeException)
  Code : MULE_ERROR-10999
  --------------------------------------------------------------------------------
  Exception stack is:
  1. [Error: could not access: foo; in class: null]
  [Near : {... Unknown ....}]
               ^
  [Line: 1, Column: 0] (org.mvel2.PropertyAccessException)
    org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer:611 (null)
  2. Execution of the expression "foo:expression" failed. (org.mule.api.expression.ExpressionRuntimeException)
    org.mule.el.mvel.MVELExpressionLanguage:211 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/expression/ExpressionRuntimeException.html)
  3. Execution of the expression "foo:expression" failed. (org.mule.api.expression.ExpressionRuntimeException) (org.mule.api.DefaultMuleException)
    org.mule.transport.http.HttpMessageReceiver$HttpWorker:323 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/DefaultMuleException.html)
  --------------------------------------------------------------------------------
  Root Exception stack trace:
  [Error: could not access: foo; in class: null]
  [Near : {... Unknown ....}]
               ^
  [Line: 1, Column: 0]
  at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getBeanProperty(ReflectiveAccessorOptimizer.java:611)
  at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getBeanPropertyAO(ReflectiveAccessorOptimizer.java:439)
  at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:353)
      + 3 more (set debug level logging or '-Dmule.verbose.exceptions=true' for everything)
  ********************************************************************************

  Show

  [04-23 20:52:12] ERROR DefaultSystemExceptionStrategy [connector.http.mule.default.receiver.02]: ******************************************************************************** Message : Execution of the expression "foo:expression" failed. (org.mule.api.expression.ExpressionRuntimeException) Code : MULE_ERROR-10999 -------------------------------------------------------------------------------- Exception stack is: 1. [Error: could not access: foo; in class: null] [Near : {... Unknown ....}]              ^ [Line: 1, Column: 0] (org.mvel2.PropertyAccessException)   org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer:611 (null) 2. Execution of the expression "foo:expression" failed. (org.mule.api.expression.ExpressionRuntimeException)   org.mule.el.mvel.MVELExpressionLanguage:211 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/expression/ExpressionRuntimeException.html) 3. Execution of the expression "foo:expression" failed. (org.mule.api.expression.ExpressionRuntimeException) (org.mule.api.DefaultMuleException)   org.mule.transport.http.HttpMessageReceiver$HttpWorker:323 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/DefaultMuleException.html) -------------------------------------------------------------------------------- Root Exception stack trace: [Error: could not access: foo; in class: null] [Near : {... Unknown ....}]              ^ [Line: 1, Column: 0] at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getBeanProperty(ReflectiveAccessorOptimizer.java:611) at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getBeanPropertyAO(ReflectiveAccessorOptimizer.java:439) at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:353)     + 3 more (set debug level logging or '-Dmule.verbose.exceptions=true' for everything) ********************************************************************************
• Similar Issues:

  None

DefaultExpressionManager#evaluate ignores invalid expression evaluators like "foo and forwards the evaluation to the expression language. Then the expression language fails with some obscure error message instead of something like "foo is not a valid expression evaluator"

To reproduce run the attached config and send a message to http://localhost:7777