Hi, I found a MVEL bug : When I want to compile a specific expression with MVEL, a NullPointerException is thrown. Test Case (Java Language) : String expression = "5 + 1/10 * (VAR - 5)"; MVEL.compileExpression(expression); When I launch this test, I get an error : java.lang.NullPointerException at org.mvel2.MVELInterpretedRuntime.parse(MVELInterpretedRuntime.java:47) at org.mvel2.MVEL.eval(MVEL.java:408) at org.mvel2.ast.Substatement.getReducedValue(Substatement.java:48) at org.mvel2.compiler.AbstractParser.arithmeticFunctionReduction(AbstractParser.java:2479) at org.mvel2.compiler.ExpressionCompiler.compileReduce(ExpressionCompiler.java:318) at org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:172) at org.mvel2.compiler.ExpressionCompiler.compile(ExpressionCompiler.java:62) at org.mvel2.MVEL.compileExpression(MVEL.java:810) at org.mvel2.MVEL.compileExpression(MVEL.java:820) at org.mvel2.MVEL.compileExpression(MVEL.java:723) ... I get this error in rare case with this syntax but with different one, it works. Expressions which work : 5 + 1+10 * (VAR - 5) 5 + 1-10 * (VAR - 5) 5 + (1/10) * (VAR - 5) 5 + (VAR - 5) * 1/10 Expressions which not work : 5 + 1/10 * (VAR - 5) 5 + 1*10 * (VAR - 5) Thanks -- View this message in context: http://drools.46999.n3.nabble.com/MVEL-BUG-MVEL-Parsing-error-tp4028939.html Sent from the Drools: User forum mailing list archive at Nabble.com.