Originally posted by Wilfred van der Deijl 2007-07-21 Hi, I'm new to Janino and am trying to use ExpressionEvaluator.createFastExpressionEvaluator(String expression, Class interfaceToImplement, String[] parameterNames, ClassLoader optionalParentClassLoader) in version 2.5.8 I run into the following runtime error: Exception in thread "main" java.lang.RuntimeException: Don't call "setReturnType(Class)" on an ExpressionEvaluator, use "setExpressionType(Class)" instead at org.codehaus.janino.ExpressionEvaluator.setReturnType(ExpressionEvaluator.java) at org.codehaus.janino.ScriptEvaluator.createFastEvaluator(ScriptEvaluator.java) at org.codehaus.janino.ScriptEvaluator.createFastEvaluator(ScriptEvaluator.java) at org.codehaus.janino.ExpressionEvaluator.createFastExpressionEvaluator(ExpressionEvaluator.java) at com.commit.consulting.janino.Client.main(Client.java:55) As it turns out, ScriptEvaluator.createFastEvaluator calls setReturnType, which is not allowed on a ExpressionEvaluator. Is it me doing something wrong or is this a bug in Janino? If it's a bug, I'm happy to submit a bug report in Jira, but I didn't want to clutter Jira with something that might be my own error. Regards, Wilfred