--- a/graal/com.oracle.graal.api.runtime/src/com/oracle/graal/api/runtime/Graal.java	Thu Mar 28 21:01:48 2013 -0700
+++ b/graal/com.oracle.graal.api.runtime/src/com/oracle/graal/api/runtime/Graal.java	Fri Mar 29 09:39:43 2013 -0700
@@ -36,26 +36,38 @@
         try {
             runtime = initializeRuntime();
         } catch (UnsatisfiedLinkError e) {
-            runtime = new GraalRuntime() {
-
-                @Override
-                public String getName() {
-                    return "";
-                }
-
-                @Override
-                public <T> T getCapability(Class<T> clazz) {
-                    return null;
-                }
-            };
+            runtime = new InvalidGraalRuntime();
         }
     }
 
     public static <T> T getRequiredCapability(Class<T> clazz) {
         T t = getRuntime().getCapability(clazz);
         if (t == null) {
-            throw new IllegalAccessError("Runtime does not expose required capability " + clazz.getName());
+            String javaHome = System.getProperty("java.home");
+            String vmName = System.getProperty("java.vm.name");
+            StringBuilder errorMessage = new StringBuilder();
+            if (runtime.getClass() == InvalidGraalRuntime.class) {
+                errorMessage.append(String.format("The VM does not support the Graal API.\n"));
+            } else {
+                errorMessage.append(String.format("The VM does not expose required Graal capability %s.\n", clazz.getName()));
+            }
+            errorMessage.append(String.format("Currently used Java home directory is %s.\n", javaHome));
+            errorMessage.append(String.format("Currently used VM configuration is: %s", vmName));
+            throw new UnsupportedOperationException(errorMessage.toString());
         }
         return t;
     }
+
+    private static final class InvalidGraalRuntime implements GraalRuntime {
+
+        @Override
+        public String getName() {
+            return "";
+        }
+
+        @Override
+        public <T> T getCapability(Class<T> clazz) {
+            return null;
+        }
+    }
 }

--- a/graal/com.oracle.graal.jtt/src/com/oracle/graal/jtt/ConvertJTT.java	Thu Mar 28 21:01:48 2013 -0700
+++ b/graal/com.oracle.graal.jtt/src/com/oracle/graal/jtt/ConvertJTT.java	Fri Mar 29 09:39:43 2013 -0700
@@ -52,8 +52,7 @@
                         try {
                             processFile(file.toPath(), new File(targetDir, file.getName()).toPath(), packageName);
                         } catch (RuntimeException e) {
-                            e.printStackTrace();
-                            System.out.println("in file " + file.getAbsolutePath());
+                            throw new RuntimeException(String.format("Exception while processing file %s", file.getAbsolutePath()), e);
                         }
                     }
                 }

--- a/graal/com.oracle.graal.jtt/src/com/oracle/graal/jtt/reflect/Field_get03.java	Thu Mar 28 21:01:48 2013 -0700
+++ b/graal/com.oracle.graal.jtt/src/com/oracle/graal/jtt/reflect/Field_get03.java	Fri Mar 29 09:39:43 2013 -0700
@@ -50,10 +50,8 @@
             FloatField = Field_get03.class.getField("floatField");
             DoubleField = Field_get03.class.getField("doubleField");
             BooleanField = Field_get03.class.getField("booleanField");
-        } catch (SecurityException e) {
-            e.printStackTrace();
-        } catch (NoSuchFieldException e) {
-            e.printStackTrace();
+        } catch (SecurityException | NoSuchFieldException e) {
+            throw new RuntimeException(e);
         }
     }
 

--- a/graal/com.oracle.graal.virtual/src/com/oracle/graal/virtual/phases/ea/EffectList.java	Thu Mar 28 21:01:48 2013 -0700
+++ b/graal/com.oracle.graal.virtual/src/com/oracle/graal/virtual/phases/ea/EffectList.java	Fri Mar 29 09:39:43 2013 -0700
@@ -53,8 +53,8 @@
                     try {
                         field.setAccessible(true);
                         str.append(str.length() > 0 ? ", " : "").append(name).append("=").append(format(field.get(this)));
-                    } catch (Exception e) {
-                        e.printStackTrace();
+                    } catch (SecurityException | IllegalAccessException e) {
+                        throw new RuntimeException(e);
                     }
                 }
             }