diff --git a/.idea/vcs.xml b/.idea/vcs.xml
index 4d824917a..e72daa733 100644
--- a/.idea/vcs.xml
+++ b/.idea/vcs.xml
@@ -25,7 +25,7 @@
             GitHub share the sequence number of issues and pull requests, and it will redirect to
             the right place when the the sequence number not match kind.
            -->
-          <option name="linkRegexp" value="https://github.com/apache/incubator-hugegraph-toolchain/pull/$1" />
+          <option name="linkRegexp" value="https://github.com/apache/hugegraph-toolchain/pull/$1" />
         </IssueNavigationLink>
       </list>
     </option>
diff --git a/hugegraph-client/src/main/java/org/apache/hugegraph/serializer/direct/HBaseSerializer.java b/hugegraph-client/src/main/java/org/apache/hugegraph/serializer/direct/HBaseSerializer.java
index 18cb87af0..3791cd36a 100644
--- a/hugegraph-client/src/main/java/org/apache/hugegraph/serializer/direct/HBaseSerializer.java
+++ b/hugegraph-client/src/main/java/org/apache/hugegraph/serializer/direct/HBaseSerializer.java
@@ -49,12 +49,12 @@ public HBaseSerializer(HugeClient client, int vertexPartitions, int edgePartitio
 
     public byte[] getKeyBytes(GraphElement e) {
         byte[] array = null;
-        if (e.type() == "vertex" && e.id() != null) {
+        if ("vertex".equals(e.type()) && e.id() != null) {
             BytesBuffer buffer = BytesBuffer.allocate(2 + 1 + e.id().toString().length());
             buffer.writeShort(getPartition(HugeType.VERTEX,  IdGenerator.of(e.id())));
             buffer.writeId(IdGenerator.of(e.id()));
             array = buffer.bytes();
-        } else if (e.type() == "edge") {
+        } else if ("edge".equals(e.type())) {
             BytesBuffer buffer = BytesBuffer.allocate(BytesBuffer.BUF_EDGE_ID);
             Edge edge = (Edge)e;
             buffer.writeShort(getPartition(HugeType.EDGE, IdGenerator.of(edge.sourceId())));
@@ -70,7 +70,7 @@ public byte[] getKeyBytes(GraphElement e) {
 
     public byte[] getValueBytes(GraphElement e) {
         byte[] array = null;
-        if (e.type() == "vertex") {
+        if ("vertex".equals(e.type())) {
             int propsCount = e.properties().size(); //vertex.sizeOfProperties();
             BytesBuffer buffer = BytesBuffer.allocate(8 + 16 * propsCount);
             buffer.writeId(IdGenerator.of(graphSchema.getVertexLabel(e.label()).id()));
@@ -81,7 +81,7 @@ public byte[] getValueBytes(GraphElement e) {
                 buffer.writeProperty(propertyKey.dataType(),entry.getValue());
             }
             array = buffer.bytes();
-        } else if (e.type() == "edge") {
+        } else if ("edge".equals(e.type())) {
             int propsCount =  e.properties().size();
             BytesBuffer buffer = BytesBuffer.allocate(4 + 16 * propsCount);
             buffer.writeVInt(propsCount);