querydsl-collections/src/main/java/com/mysema/query/collections/AbstractColQuery.java

@@ -129,7 +129,7 @@ public class AbstractColQuery<SubType extends AbstractColQuery<SubType>> impleme
         try {
             return query.count();
         } catch (Exception e) {
-            throw new RuntimeException(e);
+            throw new RuntimeException(e.getMessage(), e);
         }
     }
 
@@ -427,7 +427,7 @@ public class AbstractColQuery<SubType extends AbstractColQuery<SubType>> impleme
             try {
                 return createIterator(projection);
             } catch (Exception e) {
-                throw new RuntimeException("error", e);
+                throw new RuntimeException(e.getMessage(), e);
             }
         }
 

querydsl-collections/src/main/java/com/mysema/query/collections/eval/JaninoEvaluator.java

@@ -33,7 +33,7 @@ public class JaninoEvaluator implements Evaluator{
             Class<?> type = expr.getType() != null ? expr.getType() : Object.class;
             ev = new JavaSerializer(ops).handle(expr).createExpressionEvaluator(sources, type);
         } catch (Exception e) {
-            throw new RuntimeException(e);
+            throw new RuntimeException(e.getMessage(), e);
         }
     }
     
@@ -41,7 +41,11 @@ public class JaninoEvaluator implements Evaluator{
         try {
             return (T)ev.evaluate(args);
         } catch (InvocationTargetException e) {
-            throw new RuntimeException(e);
+            if (e.getCause() instanceof NullPointerException){
+                throw new IllegalArgumentException("null path in expression");
+            }else{
+                throw new RuntimeException(e.getMessage(), e);    
+            }            
         }
     }
 

querydsl-collections/src/main/java/com/mysema/query/collections/iterators/FilteringMultiIterator.java

@@ -112,7 +112,7 @@ public class FilteringMultiIterator extends MultiIterator implements IteratorSou
             } catch (Exception e) {
                 String error = "Caught " + e.getClass().getName();
                 logger.error(error, e);
-                throw new RuntimeException(error, e);
+                throw new RuntimeException(e.getMessage(), e);
             }
         }
         return this;

querydsl-collections/src/main/java/com/mysema/query/grammar/JavaOps.java

@@ -73,8 +73,7 @@ public class JavaOps extends OperationPatterns {
                 add(op, "Math."+getPattern(op));
             }
         } catch (Exception e) {
-            String error = "Caught " + e.getClass().getName();
-            throw new RuntimeException(error, e);
+            throw new RuntimeException(e.getMessage(), e);
         }        
         add(Ops.OpMath.MOD, "%s %% %s");
         

querydsl-collections/src/test/java/com/mysema/query/collections/ColQueryTest.java

@@ -171,7 +171,16 @@ public class ColQueryTest extends AbstractQueryTest{
         assertNotNull($(c.getKittensByName()));
         assertNotNull($(c.getKittensByName().get("Kitty")));
         from(c,cats)
-        .where($(c.getKittensByName().get("Kitty")).isnotnull()).list(cat);        
+        .where($(c.getKittensByName().get("Kitty")).isnotnull()).list(cat);       
+        
+        // 11
+        try{
+            from(cat,cats).where(cat.mate.alive).list(cat);
+            fail("expected RuntimeException");
+        }catch(RuntimeException e){
+            assertEquals("null path in expression", e.getMessage());
+        }
+        
     }
           
     @Test