[ROCKETMQ-206] Catch the IOException when call the file2String method.

client/src/main/java/org/apache/rocketmq/client/consumer/store/LocalFileOffsetStore.java

@@ -180,7 +180,12 @@ public class LocalFileOffsetStore implements OffsetStore {
     }
 
     private OffsetSerializeWrapper readLocalOffset() throws MQClientException {
-        String content = MixAll.file2String(this.storePath);
+        String content = null;
+        try {
+            content = MixAll.file2String(this.storePath);
+        } catch (IOException e) {
+            log.warn("Load local offset store file exception", e);
+        }
         if (null == content || content.length() == 0) {
             return this.readLocalOffsetBak();
         } else {
@@ -198,7 +203,12 @@ public class LocalFileOffsetStore implements OffsetStore {
     }
 
     private OffsetSerializeWrapper readLocalOffsetBak() throws MQClientException {
-        String content = MixAll.file2String(this.storePath + ".bak");
+        String content = null;
+        try {
+            content = MixAll.file2String(this.storePath + ".bak");
+        } catch (IOException e) {
+            log.warn("Load local offset store bak file exception", e);
+        }
         if (content != null && content.length() > 0) {
             OffsetSerializeWrapper offsetSerializeWrapper = null;
             try {

example/src/main/java/org/apache/rocketmq/example/benchmark/Consumer.java

@@ -17,6 +17,7 @@
 
 package org.apache.rocketmq.example.benchmark;
 
+import java.io.IOException;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Timer;
@@ -39,7 +40,7 @@ import org.apache.rocketmq.srvutil.ServerUtil;
 
 public class Consumer {
 
-    public static void main(String[] args) throws MQClientException {
+    public static void main(String[] args) throws MQClientException, IOException {
         Options options = ServerUtil.buildCommandlineOptions(new Options());
         CommandLine commandLine = ServerUtil.parseCmdLine("benchmarkConsumer", args, buildCommandlineOptions(options), new PosixParser());
         if (null == commandLine) {

example/src/main/java/org/apache/rocketmq/example/filter/Consumer.java

@@ -17,6 +17,7 @@
 package org.apache.rocketmq.example.filter;
 
 import java.io.File;
+import java.io.IOException;
 import java.util.List;
 import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
 import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
@@ -28,7 +29,7 @@ import org.apache.rocketmq.common.message.MessageExt;
 
 public class Consumer {
 
-    public static void main(String[] args) throws InterruptedException, MQClientException {
+    public static void main(String[] args) throws InterruptedException, MQClientException, IOException {
         DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("ConsumerGroupNamecc4");
 
         ClassLoader classLoader = Thread.currentThread().getContextClassLoader();

namesrv/src/main/java/org/apache/rocketmq/namesrv/kvconfig/KVConfigManager.java

@@ -43,7 +43,12 @@ public class KVConfigManager {
     }
 
     public void load() {
-        String content = MixAll.file2String(this.namesrvController.getNamesrvConfig().getKvConfigPath());
+        String content = null;
+        try {
+            content = MixAll.file2String(this.namesrvController.getNamesrvConfig().getKvConfigPath());
+        } catch (IOException e) {
+            log.warn("Load KV config table exception", e);
+        }
         if (content != null) {
             KVConfigSerializeWrapper kvConfigSerializeWrapper =
                 KVConfigSerializeWrapper.fromJson(content, KVConfigSerializeWrapper.class);