[close #666] Fix some issues in example and README (#667)

Signed-off-by: pingyu <yuping@pingcap.com>

Signed-off-by: pingyu <yuping@pingcap.com>

README.md

@@ -4,18 +4,17 @@
 
 ## TiKV JAVA Client
 
-A Java client for [TiDB](https://github.com/pingcap/tidb)/[TiKV](https://github.com/tikv/tikv).
+A Java client for [TiKV](https://github.com/tikv/tikv).
 It is supposed to:
 + Communicate via [gRPC](http://www.grpc.io/)
 + Talk to Placement Driver searching for a region
-+ Talk to TiKV for reading/writing data and the resulted data is encoded/decoded just like what we do in TiDB.
-+ Talk to Coprocessor for calculation pushdown
++ Talk to TiKV for reading/writing data
 
 ## Quick Start
 
-> TiKV Java Client is designed to communicate with [pd](https://github.com/tikv/pd) and [tikv](https://github.com/tikv/tikv), please run TiKV and PD in advance.
+> TiKV Java Client is designed to communicate with [PD](https://github.com/tikv/pd) and [TiKV](https://github.com/tikv/tikv), please run PD and TiKV in advance.
 
-Build java client from source file:
+Build Java client from source file:
 
 ```sh
 mvn clean install -Dmaven.test.skip=true
@@ -27,11 +26,27 @@ Add maven dependency to `pom.xml`:
 <dependency>
 	<groupId>org.tikv</groupId>
 	<artifactId>tikv-client-java</artifactId>
-	<version>3.1.0</version>
+	<version>3.3.0</version>
 </dependency>
 ```
 
-Create a RawKVClient and communicates with TiKV:
+Create a transactional `KVClient` and communicates with TiKV:
+
+```java
+import org.tikv.common.TiConfiguration;
+import org.tikv.common.TiSession;
+import org.tikv.txn.KVClient;
+
+public class Main {
+	public static void main(String[] args) throws Exception {
+		TiConfiguration conf = TiConfiguration.createDefault(YOUR_PD_ADDRESSES);
+		TiSession session = TiSession.create(conf);
+		KVClient client = session.createKVClient();
+	}
+}
+```
+
+Or create a `RawKVClient` if you don't need the transaction semantic:
 
 ```java
 import org.tikv.common.TiConfiguration;
@@ -39,8 +54,7 @@ import org.tikv.common.TiSession;
 import org.tikv.raw.RawKVClient;
 
 public class Main {
-	public static void main() {
-		// You MUST create a raw configuration if you are using RawKVClient.
+	public static void main(String[] args) throws Exception {
 		TiConfiguration conf = TiConfiguration.createRawDefault(YOUR_PD_ADDRESSES);
 		TiSession session = TiSession.create(conf);
 		RawKVClient client = session.createRawClient();
@@ -48,7 +62,7 @@ public class Main {
 }
 ```
 
-Find more demo in [KVRawClientTest](https://github.com/birdstorm/KVRawClientTest/)
+Find more demo in [TiKV Java Client User Documents](https://tikv.github.io/client-java/examples/introduction.html)
 
 ## Documentation
 

docs/src/examples/quick-start.md

@@ -24,7 +24,7 @@ Add maven dependency to `pom.xml`.
 <dependency>
   <groupId>org.tikv</groupId>
   <artifactId>tikv-client-java</artifactId>
-  <version>3.1.0</version>
+  <version>3.3.0</version>
 </dependency>
 <dependency>
   <groupId>org.slf4j</groupId>

docs/src/examples/rawkv.md

@@ -15,7 +15,7 @@ import org.tikv.raw.RawKVClient;
 import org.tikv.shade.com.google.protobuf.ByteString;
 
 public class Main {
-  public static void main() {
+  public static void main(String[] args) throws Exception {
     // You MUST create a raw configuration if you are using RawKVClient.
     TiConfiguration conf = TiConfiguration.createRawDefault("127.0.0.1:2379");
     TiSession session = TiSession.create(conf);
@@ -61,7 +61,7 @@ To enable the API V2 mode, users need to specify the API version of the client.
 import org.tikv.common.TiConfiguration.ApiVersion;
 
 public class Main {
-  public static void main() {
+  public static void main(String[] args) throws Exception {
     TiConfiguration conf = TiConfiguration.createRawDefault("127.0.0.1:2379");
     conf.setApiVersion(ApiVersion.V2);
     try(TiSession session = TiSession.create(conf)) {

docs/src/examples/txnkv.md

@@ -23,7 +23,7 @@ import org.tikv.txn.TwoPhaseCommitter;
 
 public class App {
     public static void main(String[] args) throws Exception {
-        TiConfiguration conf = TiConfiguration.createDefault("127.0.0.1:2389");
+        TiConfiguration conf = TiConfiguration.createDefault("127.0.0.1:2379");
         try (TiSession session = TiSession.create(conf)) {
             // two-phrase write
             long startTS = session.getTimestamp().getVersion();