diff --git a/src/main/java/com/mysema/codegen/MemClassLoader.java b/src/main/java/com/mysema/codegen/MemClassLoader.java
index 41bbdce3e..1c5db6fa2 100644
--- a/src/main/java/com/mysema/codegen/MemClassLoader.java
+++ b/src/main/java/com/mysema/codegen/MemClassLoader.java
@@ -17,6 +17,7 @@ import java.util.Enumeration;
 import java.util.List;
 import java.util.Map;
 
+import javax.annotation.Nullable;
 import javax.tools.JavaFileObject;
 import javax.tools.StandardLocation;
 import javax.tools.JavaFileObject.Kind;
@@ -55,6 +56,7 @@ public final class MemClassLoader extends ClassLoader {
     }
     
     @Override
+    @Nullable
     protected URL findResource(String name) {
         URL retValue = super.findResource(name);
         if(retValue != null) {
@@ -73,6 +75,7 @@ public final class MemClassLoader extends ClassLoader {
         }
     }
     
+    @Nullable
     private JavaFileObject getFileObject(String n) {
         LocationAndKind key;
         String name;                
@@ -94,6 +97,7 @@ public final class MemClassLoader extends ClassLoader {
     }
 
     @Override
+    @Nullable
     public InputStream getResourceAsStream(String name) {
         JavaFileObject jfo = getFileObject(name);
         if (jfo != null) {
diff --git a/src/main/java/com/mysema/codegen/MemJavaFileObject.java b/src/main/java/com/mysema/codegen/MemJavaFileObject.java
index adcdaff46..b736dda0b 100644
--- a/src/main/java/com/mysema/codegen/MemJavaFileObject.java
+++ b/src/main/java/com/mysema/codegen/MemJavaFileObject.java
@@ -15,6 +15,7 @@ import java.io.InputStream;
 import java.io.OutputStream;
 import java.net.URI;
 
+import javax.annotation.Nullable;
 import javax.tools.SimpleJavaFileObject;
 
 /**
@@ -25,6 +26,7 @@ import javax.tools.SimpleJavaFileObject;
  */
 public class MemJavaFileObject extends SimpleJavaFileObject {
     
+    @Nullable
     private ByteArrayOutputStream baos;
     
     private final String name;
diff --git a/src/main/java/com/mysema/codegen/SimpleCompiler.java b/src/main/java/com/mysema/codegen/SimpleCompiler.java
index 251eb07f9..e6d99741c 100644
--- a/src/main/java/com/mysema/codegen/SimpleCompiler.java
+++ b/src/main/java/com/mysema/codegen/SimpleCompiler.java
@@ -19,6 +19,7 @@ import java.util.List;
 import java.util.Locale;
 import java.util.Set;
 
+import javax.annotation.Nullable;
 import javax.lang.model.SourceVersion;
 import javax.tools.DiagnosticListener;
 import javax.tools.JavaCompiler;
@@ -54,6 +55,7 @@ public class SimpleCompiler implements JavaCompiler{
     
     private final ClassLoader classLoader;
     
+    @Nullable
     private String classPath;    
     
     private final JavaCompiler compiler;