Generate hashcode on the java types.

editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/AnalysisError.java

Index: editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/AnalysisError.java
diff --git a/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/AnalysisError.java b/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/AnalysisError.java
index cfb949dcd4fd1581cfd11534b058ba17e87f7fd7..cc05c2d82e16a5bd0acb97bb207d4d0cedb328a6 100644
--- a/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/AnalysisError.java
+++ b/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/types/AnalysisError.java
@@ -26,6 +26,7 @@ import com.google.gson.JsonArray;
 import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
 import com.google.gson.JsonPrimitive;
+import org.apache.commons.lang3.builder.HashCodeBuilder;
 import java.util.ArrayList;
 import java.util.Iterator;
 import org.apache.commons.lang3.StringUtils;
@@ -154,6 +155,17 @@ public class AnalysisError {
     return type;
   }
 
+  @Override
+  public int hashCode() {
+    HashCodeBuilder builder = new HashCodeBuilder();
+    builder.append(severity);
+    builder.append(type);
+    builder.append(location);
+    builder.append(message);
+    builder.append(correction);
+    return builder.toHashCode();
+  }
+
   public JsonObject toJson() {
     JsonObject jsonObject = new JsonObject();
     jsonObject.addProperty("severity", severity);