Introduced a private GwtIncompatible annotation

java/com.sap.sse.common/src/com/sap/sse/common/settings/GwtIncompatible.java

@@ -0,0 +1,27 @@
+package com.sap.sse.common.settings;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Private version of com.google.gwt.core.shared.GwtIncompatible.
+ * GWT doesn't check for the concrete annotation class but only checks if there is an annotation named GwtIncompatible.
+ * With this private annotation we can flag something as GWT incompatible without introducing a dependency to GWT core.
+ *
+ */
+@Retention(RetentionPolicy.CLASS)
+@Target({
+    ElementType.TYPE, ElementType.METHOD,
+    ElementType.CONSTRUCTOR, ElementType.FIELD })
+@Documented
+public @interface GwtIncompatible {
+  /**
+   * An attribute that can be used to explain why the code is incompatible.
+   * A GwtIncompatible annotation can have any number of attributes; attributes
+   * are for documentation purposes and are ignored by the GWT compiler.
+   */
+  String value() default "";
+}

java/com.sap.sse.common/src/com/sap/sse/common/settings/SerializableSettings.java

@@ -5,7 +5,6 @@ import java.io.ObjectInputStream;
 import java.io.ObjectOutputStream;
 import java.io.Serializable;
 
-import com.google.gwt.core.shared.GwtIncompatible;
 import com.sap.sse.common.settings.value.SettingsValue;
 
 public abstract class SerializableSettings extends AbstractSettings implements Serializable {