1.使用的环境是Solr5.3.1和JDK1.7

2.使用Solr自带的Jetty在远程的一台机器:192.168.1.155上启动Solr，其实我也试过使用Tomcat的方式来启动Solr，也有相同的问题。其中创建的core 的名字叫"universal"

3. 下面是相关的Junit Test
@Test
   public void queryTest() throws SolrServerException, IOException {
     SolrClient solrClient = new HttpSolrClient("http://192.168.1.155:8983/solr/universal");
    
     SolrParams params = new SolrQuery("id:7");
     QueryResponse response = solrClient.query(params);
     System.out.println( " result ---- " + response);
     solrClient.close();
}

4.有时候运行单元测试的时候是成功的：
result ---- {responseHeader={status=0,QTime=0,params={q=id:7,wt=javabin,version=2}},response={numFound=1,start=0,docs=[SolrDocument{id=6, name=[HTC-TopOne], manu=HTC music。, popularity=[9], last_update_time=Fri Nov 06 11:23:23 CST 2015, _version_=1517177477028380672}]}}


5. 有时候是失败的，如果失败了，但如果我接着多运行几次，就会成功，如果接着运行，就会一直成功，但是当我停一分钟再运行，单元测试又失败了，异常就是Socket Connection Exception,我调试过源码，确实是Socket异常。

org.apache.solr.client.solrj.SolrServerException: Server refused connection at: http://192.168.1.155:8983/solr/universal
at org.apache.solr.client.solrj.impl.HttpSolrClient.executeMethod(HttpSolrClient.java:567)
at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:234)
at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:226)
at org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:135)
at org.apache.solr.client.solrj.SolrClient.query(SolrClient.java:943)
at org.apache.solr.client.solrj.SolrClient.query(SolrClient.java:958)
at solr.TestSolrActionProxy.queryTest(TestSolrActionProxy.java:149)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.net.ConnectException: Connection timed out: connectx
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:579)
at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:117)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:177)
at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:304)
at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:611)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:446)
at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:882)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:107)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:55)
at org.apache.solr.client.solrj.impl.HttpSolrClient.executeMethod(HttpSolrClient.java:465)
... 30 more


7. 所以我写了一段简单的代码来测试，发现确实在这种情况下，Socket有时会存在Connection异常，有时又是正常的。


public static void main(String[] args)  {
     Socket socket = new Socket();
     InetSocketAddress remoteAddress = new InetSocketAddress("192.168.1.155", 8983);
     try {
        socket.setKeepAlive(true);
        socket.connect(remoteAddress, 5000);
        System.out.println("----------------- end normallly");
     } catch (IOException e) {
        e.printStackTrace();
     }
    
     System.out.println(" ------------------- end ");
   }


大家有碰到过类似的问题没？