<div>This is not correct:</div> Foo( id == "\a" )<div>and it is rightly flagged as a syntax error, but the ensuing stack dump is uncalled for:</div><div><br></div><div><div>Exception in thread "main" [Error: illegal escape sequence: a]</div>
<div>[Near : {... "\a" ....}]</div><div> ^</div><div>[Line: 1, Column: 3]</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>at org.mvel2.util.ParseTools.handleEscapeSequence(ParseTools.java:889)</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>at org.mvel2.util.ParseTools.handleStringEscapes(ParseTools.java:1533)</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>at org.mvel2.compiler.AbstractParser.nextToken(AbstractParser.java:1105)</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>at org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:128)</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>at org.mvel2.compiler.ExpressionCompiler.compile(ExpressionCompiler.java:62)</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>at org.mvel2.MVEL.analysisCompile(MVEL.java:670)</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>at org.mvel2.MVEL.analysisCompile(MVEL.java:674)</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>at org.drools.rule.builder.PatternBuilder.setInputs(PatternBuilder.java:942)</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>at org.drools.rule.builder.PatternBuilder.buildRelationalExpression(PatternBuilder.java:638)</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:588)</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>at org.drools.rule.builder.PatternBuilder.processConstraintsAndBinds(PatternBuilder.java:449)</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:296)</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:118)</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>at org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:65)</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:80)</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:2503)</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:847)</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:443)</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:626)</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:41)</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>at foobar.Main.setup(Main.java:68)</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>at foobar.Main.main(Main.java:124)</div></div><div><br></div><div>-W</div><div><br></div>