This question already has answers here:
Official reasons for "Software caused connection abort: socket write error"
(14 answers)
Closed 5 years ago.
all.
I have encounter the problem for some days, this is the detail stack information:
org.springframework.dao.RecoverableDataAccessException:
### Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 18,940 milliseconds ago. The last packet sent successfully to the server was 18,918 milliseconds ago.
### The error may involve com.tuan800.searchtask.model.dao.mybatis.RelationDao.updateSuggest-Inline
### The error occurred while setting parameters
### Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 18,940 milliseconds ago. The last packet sent successfully to the server was 18,918 milliseconds ago.
; SQL []; Communications link failure
The last packet successfully received from the server was 18,940 milliseconds ago. The last packet sent successfully to the server was 18,918 milliseconds ago.; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 18,940 milliseconds ago. The last packet sent successfully to the server was 18,918 milliseconds ago.
at org.springframework.jdbc.support.SQLExceptionSubclassTranslator.doTranslate(SQLExceptionSubclassTranslator.java:98)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:72)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:80)
at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:71)
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:346)
at $Proxy10.update(Unknown Source)
at org.mybatis.spring.SqlSessionTemplate.update(SqlSessionTemplate.java:245)
at com.tuan800.searchtask.model.dao.mybatis.impl.RelationDaoImpl.updateSuggest(RelationDaoImpl.java:24)
at com.tuan800.searchtask.service.impl.RelationServiceImpl.modifyRelationCount(RelationServiceImpl.java:64)
at com.tuan800.searchtask.RelationIndexTask.main(RelationIndexTask.java:33)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:115)
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 18,940 milliseconds ago. The last packet sent successfully to the server was 18,918 milliseconds ago.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1118)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3055)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2941)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3489)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1959)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2113)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2568)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2113)
at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1364)
at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.execute(NewProxyPreparedStatement.java:989)
at sun.reflect.GeneratedMethodAccessor163.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.ibatis.logging.jdbc.PreparedStatementLogger.invoke(PreparedStatementLogger.java:45)
at $Proxy20.execute(Unknown Source)
at org.apache.ibatis.executor.statement.PreparedStatementHandler.update(PreparedStatementHandler.java:22)
at org.apache.ibatis.executor.statement.RoutingStatementHandler.update(RoutingStatementHandler.java:51)
at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:29)
at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:88)
at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:121)
at sun.reflect.GeneratedMethodAccessor165.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:338)
... 10 more
Caused by: java.net.SocketException: Software caused connection abort: recv failed
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:114)
at com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:161)
at com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:189)
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2499)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2952)
... 32 more
I want update a record in mysql by mybatis and spring,and I update it one by one,below is mybatis config:
update suggestions set count = #{count},version=#{version},freq=#{freq} where id = #{id}
And the service code:
for(RelationBvo relation : list){
Long totalCount = solrDealService.queryResult(relation.getWord(),null,null,0);
relation.setCount(totalCount.intValue());
if(relation.getFreq() == 0){
relation.setFreq(1);
}
***relationDao.updateSuggest(relation);//update record***
executedCount++;
logger.info("Program have executed "+executedCount+" records.");
}
can anyone help me?thanks very much.
Your mySQL connections are timing out before your connection pool recognizes them. There are multiple ways to fix this:
Increase the timeout value in mysql config file (my.ini)
Reduce the idle time in your connection pool, so that it will discard the connection before mysql will close it
Add a validate connection query in your pool config so that the pool tests each connection before it gives it to you, but this can slow down the system terribly.
Related
I am running the following method:
private static void bulkLoad() throws SQLException{
final Connection connection = DriverManager.getConnection(connectionURL);
final Statement s = connection.createStatement();
s.execute("LOAD DATA LOCAL INFILE 'LoadData.txt' INTO TABLE emails FIELDS TERMINATED BY ',' LINES TERMINATED BY '\r\n'");
}
But am inconsistently (sometimes I get it and sometimes I don't) getting this error:
Exception in thread "main" com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 114,558 milliseconds ago. The last packet sent successfully to the server was 104,210 milliseconds ago.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:983)
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3644)
at com.mysql.jdbc.MysqlIO.sendFileToServer(MysqlIO.java:3730)
at com.mysql.jdbc.MysqlIO.readResultsForQueryOrUpdate(MysqlIO.java:3030)
at com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:2280)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2673)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2546)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2504)
at com.mysql.jdbc.StatementImpl.executeInternal(StatementImpl.java:840)
at com.mysql.jdbc.StatementImpl.execute(StatementImpl.java:740)
at SendEmailTools.bulkLoad(SendEmailTools.java:18)
at SendEmailTools.main(SendEmailTools.java:110)
Caused by: java.net.SocketException: Connection reset by peer: socket write error
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(Unknown Source)
at java.net.SocketOutputStream.write(Unknown Source)
at java.io.BufferedOutputStream.write(Unknown Source)
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3625)
... 10 more
At first, I figured it may be a timeout issue, but I checked my wait_timeout and saw it is set to 28800, which should be more than enough time. Does anyone know what's wrong?
I have a problem, which I have not been able to resolve for a couple of days now.. So, i'm trying to list a large resultset row by row with the solution, cited multiple times on the internets, including stackoverflow:
Statement stmt = readOnlyConn.createStatement(java.sql.ResultSet.TYPE_FORWARD_ONLY, java.sql.ResultSet.CONCUR_READ_ONLY);
stmt.setFetchSize(Integer.MIN_VALUE);
and it seems to work. At least for some time (it writes out the lines into a text file) until I get the error below. I have googled my eyes out trying to find what could be causing this, tried some mysql server tweaks, nothing works. Can anyone please help me? Everyone keeps reporting splendid results with the solution above, but it seems to hate me in particular.. I would greatly appreciate any help.
java.lang.RuntimeException: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 15 milliseconds ago. The last packet sent successfully to the server was 6,239 milliseconds ago.
at gblaster.main.lambda$main$1(main.java:134)
at gblaster.main$$Lambda$3/792791759.accept(Unknown Source)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1359)
at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580)
at gblaster.main.main(main.java:124)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 15 milliseconds ago. The last packet sent successfully to the server was 6,239 milliseconds ago.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1129)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3720)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3609)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4160)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:928)
at com.mysql.jdbc.MysqlIO.nextRow(MysqlIO.java:2053)
at com.mysql.jdbc.MysqlIO.readSingleRowSet(MysqlIO.java:3554)
at com.mysql.jdbc.MysqlIO.getResultSet(MysqlIO.java:491)
at com.mysql.jdbc.MysqlIO.readResultsForQueryOrUpdate(MysqlIO.java:3245)
at com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:2413)
at com.mysql.jdbc.ServerPreparedStatement.serverExecute(ServerPreparedStatement.java:1500)
at com.mysql.jdbc.ServerPreparedStatement.executeInternal(ServerPreparedStatement.java:857)
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2313)
at db.mysql.GMySQLConnector.loadAllOrfsForGenomeId(GMySQLConnector.java:296)
at gblaster.deploy.Deployer.unloadORFsForGenomeToFile(Deployer.java:124)
at gblaster.main.lambda$main$1(main.java:128)
... 9 more
Caused by: java.io.IOException: Packets received out of order
at com.mysql.jdbc.MysqlIO.readRemainingMultiPackets(MysqlIO.java:3782)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3707)
... 23 more
Your code is difficult to understand because Integer.MIN_VALUE is negative,
stmt.setFetchSize(Integer.MIN_VALUE);
I think you'll find it works much better with
stmt.setFetchSize(100); // <-- I also bet this works better then 1.
Finally, the Statement.setFetchSize(int) javadoc says (emphasis added),
Throws:
SQLException - if a database access error occurs, this method is called on a closed Statement or the condition rows >= 0 is not satisfied.
So you should be getting a SQLException with your code.
I used java to query some records from Mysql. But in some querys of one duration, i meet a problem which make query failed, but in others , it query successful. The error message is next:
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 90 milliseconds ago. The last packet sent successfully to the server was 1,674 milliseconds ago.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3090)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2979)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3520)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:935)
at com.mysql.jdbc.MysqlIO.nextRow(MysqlIO.java:1433)
at com.mysql.jdbc.MysqlIO.readSingleRowSet(MysqlIO.java:2924)
at com.mysql.jdbc.MysqlIO.getResultSet(MysqlIO.java:477)
at com.mysql.jdbc.MysqlIO.readResultsForQueryOrUpdate(MysqlIO.java:2619)
at com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:1788)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2209)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2619)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2569)
at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1521)
......
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:58)
Caused by: java.io.IOException: Packets received out of order
at com.mysql.jdbc.MysqlIO.readRemainingMultiPackets(MysqlIO.java:3152)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3077)
... 23 more
I have tried some method, such like:
set max_allowed_packet = 128 * 1024 * 1024 in /etc/my.conf
add ?autoReconnect=true&failOverReadOnly=false&maxReconnects=10 to my connection url
but nothing happens.
My environments is:
Mysql: 5.5.3-m3-log Source distribution
Java: 1.6.0_16
Jdk: HotSpot(TM) 64-Bit Server VM (build 14.2-b01, mixed mode)
JDBC: mysql-connector-java-5.1.18
The problem are solved.
It is because the result is too huge. In my query , i used the default cursor, which is client-side cursors, This means, the whole resultant recordset of a SELECT is returned to the client (application) and the paging is done there. So the total result set is too big and make jdbc client out of memory.
The solution is that:
add "useCursorFetch=true" to JDBC URL configuration parameters
call statement.setFetchSize(100)
You can read more detail from : http://wiki.gxtechnical.com/commwiki/servlet/hwiki?Client%20and%20server%20cursors%20-%20using%20MySQL
This might happen when you try to commit with stale connection. Try checking for the connection state before doing the commit.
I have an application set up to pool mysql connections with BoneCP. Right now, the application isn't getting a ton of use, so the connections aren't used as frequently. After a certain amount of time, queries that once worked, start to fail, and I get messages similar to this:
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 2,618,063 milliseconds ago. The last packet sent successfully to the server was 44,734 milliseconds ago.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1117)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3567)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3456)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3997)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2468)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2629)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2719)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155)
at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1379)
at com.jolbox.bonecp.PreparedStatementHandle.execute(PreparedStatementHandle.java:138)
I am setting up BoneCP like this:
BoneCPConfig config = new BoneCPConfig();
config.setJdbcUrl("jdbc:mysql://" + hostname + "/" + database);
config.setUsername(username);
config.setPassword(password);
config.setMinConnectionsPerPartition(minPoolSize);
config.setMaxConnectionsPerPartition(maxPoolSize);
config.setIdleConnectionTestPeriodInMinutes(60);
config.setIdleMaxAgeInMinutes(240);
config.setPartitionCount(1);
connectionPool = new BoneCP(config);
I'm unsure of how to find out what the timeout is for the mysql server (it hasn't been changed from whatever the default is), but I get this error after around 5 or 10 mins of no connection pool activity, which seems extremely short.
Either you'll have to configure mysqls idle timeout (setting wait_timeout = X / interactive_timeout = X), or you could configure the connection pool to issue keep-alive statements:
config.setIdleConnectionTestPeriodInMinutes(10);
config.setConnectionTestStatement("/* ping */ SELECT 1"):
I am having issues trying to get a database connection using the code below:
try {
Class.forName("com.mysql.jdbc.Driver");
Properties p = new Properties();
p.put("user", user_name);
p.put("password", password);
connection = DriverManager.getConnection("jdbc:mysql://127.0.0.1/jsp_test", p);
} catch (SQLException ex) {
// handle any errors
ex.printStackTrace();
System.out.println("SQLException: " + ex.getMessage());
System.out.println("SQLState: " + ex.getSQLState());
System.out.println("VendorError: " + ex.getErrorCode());
return false;
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
The error message that is outputted is:
/usr/lib/jvm/java-6-openjdk/bin/java
-Didea.launcher.port=7532 -Didea.launcher.bin.path=/usr/bin/idea/bin
-Dfile.encoding=UTF-8 -classpath /usr/lib/jvm/java-6-openjdk/jre/lib/jce.jar:/usr/lib/jvm/java-6-openjdk/jre/lib/about.jar:/usr/lib/jvm/java-6-openjdk/jre/lib/resources.jar:/usr/lib/jvm/java-6-openjdk/jre/lib/management-agent.jar:/usr/lib/jvm/java-6-openjdk/jre/lib/jsse.jar:/usr/lib/jvm/java-6-openjdk/jre/lib/charsets.jar:/usr/lib/jvm/java-6-openjdk/jre/lib/rt.jar:/usr/lib/jvm/java-6-openjdk/jre/lib/ext/localedata.jar:/usr/lib/jvm/java-6-openjdk/jre/lib/ext/sunjce_provider.jar:/usr/lib/jvm/java-6-openjdk/jre/lib/ext/sunpkcs11.jar:/usr/lib/jvm/java-6-openjdk/jre/lib/ext/dnsns.jar:/home/bedtimes/Java
Projects/db_demo/out/production/db_demo:/opt/java/jre/lib/ext/mysql-connector-java-5.1.10-bin.jar:/usr/bin/idea/lib/idea_rt.jar com.intellij.rt.execution.application.AppMain
Main
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException:
Communications link failure
The last packet sent successfully to
the server was 0 milliseconds ago. The
driver has not received any packets
from the server. at
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method) at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at
java.lang.reflect.Constructor.newInstance(Constructor.java:532)
at
com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
at
com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074)
at
com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2214)
at
com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:781)
at
com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:46)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method) at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at
java.lang.reflect.Constructor.newInstance(Constructor.java:532)
at
com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
at
com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:352)
at
com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:284)
at
java.sql.DriverManager.getConnection(DriverManager.java:620)
at
java.sql.DriverManager.getConnection(DriverManager.java:169)
at
database.Database.connect(Database.java:80)
at Main.main(Main.java:13) 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:616)
at
com.intellij.rt.execution.application.AppMain.main(AppMain.java:110)
Caused by:
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException:
Communications link failure
The last packet sent successfully to
the server was 0 milliseconds ago. The
driver has not received any packets
from the server. at
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method) at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at
java.lang.reflect.Constructor.newInstance(Constructor.java:532)
at
com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
at
com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074)
at
com.mysql.jdbc.MysqlIO.(MysqlIO.java:343)
at
com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2137)
... 18 more Caused by:
java.net.ConnectException: Connection
refused at
java.net.PlainSocketImpl.socketConnect(Native
Method) at
java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:310)
at
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:176)
at
java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:163)
at
java.net.SocksSocketImpl.connect(SocksSocketImpl.java:384)
at
java.net.Socket.connect(Socket.java:542)
at
java.net.Socket.connect(Socket.java:492)
at
java.net.Socket.(Socket.java:389)
at
java.net.Socket.(Socket.java:232)
at
com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:253)
at
com.mysql.jdbc.MysqlIO.(MysqlIO.java:292)
... 19 more SQLException:
Communications link failure
The last packet sent successfully to
the server was 0 milliseconds ago. The
driver has not received any packets
from the server. SQLState: 08S01
VendorError: 0
Process finished with exit code 0
I've, literally, no idea how to troubleshoot this error message. The database exists. The username and password exists. I've currently not added any tables to the database but I don't think that can be the issue, since I'm only making a connection after all...
I can provide extra information if needs be. I feel like I've tried a lot. Does anybody know any ways of getting further information on how and why it's failing?
Thanks for your help! :)
From your connection string, this database should be on the local machine. Can you try running this command to ensure the socket is open for connections?
telnet 127.0.0.1 3306
and ensure that it connects? You may not have configured your mysql instance to listen for connections from this machine or on this interface address. If the connection fails, you need to modify your mysql config, for example:
http://www.cyberciti.biz/tips/how-do-i-enable-remote-access-to-mysql-database-server.html
I had the same symptoms but for me the solution was to change the bind-address to 0.0.0.0 in /etc/mysql/my.cnf
(Just posting this for others seeking an answer to this question)
You can try this instead:
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/jsp_test","user_name","password");
you can try one of the following
"jdbc:mysql://localhost:3306/jsp_test","username","password"
or
"jdbc:mysql://'your machines ip (without quote)':3306/jsp_test","username","password"
or
"jdbc:mysql://127.0.0.1:3306/jsp_test","username","password"
as a connection string.