Major Description
According to the JMS specification, an "empty string" message selector indicates no message selector (i.e., all messages should be selected):
"A message selector is a String whose syntax is based on a subset of the SQL92 conditional expression syntax. If the value of a message selector is an empty string, the value is treated as a null and indicates that there is no message selector for the message consumer."
However, if org.apache.activemq.broker.region.Queue#removeMatchingMessages(String selector) with selector = "", the following stacktrace is generated:
javax.jms.InvalidSelectorException:
at org.apache.activemq.selector.SelectorParser.parse(SelectorParser.java:72)
at org.apache.activemq.selector.SelectorParser.parse(SelectorParser.java:46)
at org.apache.activemq.broker.region.Queue.createSelectorFilter(Queue.java:1200)
at org.apache.activemq.broker.region.Queue.removeMatchingMessages(Queue.java:908)
at org.apache.activemq.broker.region.Queue.removeMatchingMessages(Queue.java:898)
at com.invoqsystems.foundation.utility.AMQUtility.deleteMessages(AMQUtility.java:192)
at com.invoqsystems.foundation.utility.AMQUtilityTest.testDeleteMessages(AMQUtilityTest.java:187)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.internal.runners.TestMethodRunner.executeMethodBody(TestMethodRunner.java:99)
at org.junit.internal.runners.TestMethodRunner.runUnprotected(TestMethodRunner.java:81)
at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)
at org.junit.internal.runners.TestMethodRunner.runMethod(TestMethodRunner.java:75)
at org.junit.internal.runners.TestMethodRunner.run(TestMethodRunner.java:45)
at org.junit.internal.runners.TestClassMethodsRunner.invokeTestMethod(TestClassMethodsRunner.java:71)
at org.junit.internal.runners.TestClassMethodsRunner.run(TestClassMethodsRunner.java:35)
at org.junit.internal.runners.TestClassRunner$1.runUnprotected(TestClassRunner.java:42)
at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)
at org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:38)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
Caused by: org.apache.activemq.selector.ParseException: Parse error at line 0, column 0. Encountered: <EOF>
at org.apache.activemq.selector.SelectorParser.generateParseException(SelectorParser.java:1196)
at org.apache.activemq.selector.SelectorParser.jj_consume_token(SelectorParser.java:1148)
at org.apache.activemq.selector.SelectorParser.unaryExpr(SelectorParser.java:453)
at org.apache.activemq.selector.SelectorParser.multExpr(SelectorParser.java:375)
at org.apache.activemq.selector.SelectorParser.addExpression(SelectorParser.java:344)
at org.apache.activemq.selector.SelectorParser.comparisonExpression(SelectorParser.java:196)
at org.apache.activemq.selector.SelectorParser.equalityExpression(SelectorParser.java:141)
at org.apache.activemq.selector.SelectorParser.andExpression(SelectorParser.java:120)
at org.apache.activemq.selector.SelectorParser.orExpression(SelectorParser.java:99)
at org.apache.activemq.selector.SelectorParser.JmsSelector(SelectorParser.java:91)
at org.apache.activemq.selector.SelectorParser.parse(SelectorParser.java:69)
... 26 more