Android Tutorial Remote Database Connector (RDC) - Connect to any remote DB

Dear Erel

I changed the method to test
and now the message in Log is coming like this
SQLException: An attempt by a client to checkout a connection has timed out.


I have followed exactly as the code module.

in config.properties I am giving
#SQL Server
DriverClass=net.sourceforge.jtds.jdbc.Driver
JdbcUrl=jdbc:jtds:sqlserver://192.168.2.110:17178/testdata
User=myuser
Password=mypass
ServerPort=17178


testdata is my database

I can connect to my database in ODBC by giving the server as 192.168.2.110/SQL2
SQL2 is the instance of SQL Server.

Please suggest the exact changes I should make in config.properties.

 

I changed to 1433 but still same error is coming

#SQL Server
DriverClass=net.sourceforge.jtds.jdbc.Driver
JdbcUrl=jdbc:jtds:sqlserver://49.249.131.39:1433/SQL2\testdata
User=sal
Password=data123
ServerPort=17178
#If Debug is true then this file will be reloaded on every query.
#This is useful if you need to modify the queries.
Debug=true

I changed it like this also
JdbcUrl=jdbc:jtds:sqlserver://49.249.131.39:1433\testdata

JdbcUrl=jdbc:jtds:sqlserver://49.249.131.39\testdata

but nothing works where is the problem.

I can read the database using ODBC, ADO.Net etc.

 

Remote connection is also allowed but the problem still persists.

 

Db server is on the same computer as RDc and also the firewalls are opened, still the problem exists.

 

The following error is coming in RDC LOG when I am testing it in internet with the following
http://localhost:17178/?method=test

instead of localhost I have tried 127.0.0.1 and also the IP of the computer


My config.properties file is as follows
#Lines starting with '#' are comments.
#Backslash character at the end of line means that the command continues in the next line.

#DriverClass=com.mysql.jdbc.Driver
#JdbcUrl=jdbc:mysql://192.168.2.110/test?characterEncoding=utf8
#SQL Server
riverClass=net.sourceforge.jtds.jdbc.Drive
JdbcUrl=jdbc:jtds:sqlserver://198.68.2.105/testdata
User=sal
Password=mypass
ServerPort=17178
#If Debug is true then this file will be reloaded on every query.
#This is useful if you need to modify the queries.
Debug=true
#commands
sql.select_party=SELECT party_nm, acc_id FROM z_par_0001 WHERE bal_cd = 'A5'

(In the properties JdbcUrl I have tried with ip:1433 etc etc. Pls suggest the changes)


RDC LOG OUTPUT :

F:\android_projects\b4android\rdc\rdcserver\RemoteDatabaseConnector>"C:\Program
Files\Java\jdk1.7.0_45\bin\java" -Xmx256m -cp .;libs\*;jdbc_driver\* anywheresof
tware.b4a.remotedatabase.RemoteServer
B4A Remote Database Connecter (version 0.9)
loading: F:\android_projects\b4android\rdc\rdcserver\RemoteDatabaseConnector\con
fig.properties
2014-01-14 17:39:15.905:INFO::jetty-7.4.2.v20110526
2014-01-14 17:39:15.970:INFO::started o.e.j.s.ServletContextHandler{/,null}
Jan 14, 2014 5:39:16 PM com.mchange.v2.log.MLog <clinit>
INFO: MLog clients using java 1.4+ standard logging.
Jan 14, 2014 5:39:16 PM com.mchange.v2.c3p0.C3P0Registry banner
INFO: Initializing c3p0-0.9.2.1 [built 20-March-2013 11:16:28 +0000; debug? true
; trace: 10]
2014-01-14 17:39:16.428:INFO::Started SelectChannelConnector@0.0.0.0:17178 START
ING
Jan 14, 2014 5:39:22 PM com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource ge
tPoolManager
INFO: Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acqu
ireIncrement -> 3, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCo
mmitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> fa
lse, checkoutTimeout -> 20000, connectionCustomizerClassName -> null, connection
TesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, dataSourceN
ame -> 1hge1d58z144xb2szd06bu|c042ab, debugUnreturnedConnectionStackTraces -> fa
lse, description -> null, driverClass -> null, factoryClassLocation -> null, for
ceIgnoreUnresolvedTransactions -> false, identityToken -> 1hge1d58z144xb2szd06bu
|c042ab, idleConnectionTestPeriod -> 600, initialPoolSize -> 3, jdbcUrl -> jdbc:
jtds:sqlserver://198.68.2.105/suruchi, maxAdministrativeTaskTime -> 0, maxConnec
tionAge -> 0, maxIdleTime -> 1800, maxIdleTimeExcessConnections -> 0, maxPoolSiz
e -> 15, maxStatements -> 150, maxStatementsPerConnection -> 0, minPoolSize -> 3
, numHelperThreads -> 3, preferredTestQuery -> null, properties -> {user=******,
password=******}, propertyCycle -> 0, statementCacheNumDeferredCloseThreads ->
0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturn
edConnectionTimeout -> 0, userOverrides -> {}, usesTraditionalReflectiveProxies
-> false ]
java.sql.SQLException: An attempt by a client to checkout a Connection has timed
out.
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:118)
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:77)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConne
ction(C3P0PooledConnectionPool.java:687)
at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(A
bstractPoolBackedDataSource.java:140)
at anywheresoftware.b4a.remotedatabase.Servlet.doGet(Servlet.java:64)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:538
)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java
:478)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandl
er.java:937)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:
406)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandle
r.java:871)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.j
ava:117)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper
.java:110)
at org.eclipse.jetty.server.Server.handle(Server.java:346)
at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.
java:589)
at org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete
(HttpConnection.java:1048)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:601)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:214)
at org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:41
1)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEn
dPoint.java:535)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEnd
Point.java:40)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool
.java:529)
at java.lang.Thread.run(Thread.java:744)
Caused by: com.mchange.v2.resourcepool.TimeoutException: A client timed out whil
e waiting to acquire a resource from com.mchange.v2.resourcepool.BasicResourcePo
ol@68fede -- timeout at awaitAvailable()
at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicRes
ourcePool.java:1416)
at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(
BasicResourcePool.java:606)
at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicR
esourcePool.java:526)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConn
ectionInUse(C3P0PooledConnectionPool.java:755)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConne
ction(C3P0PooledConnectionPool.java:682)

 

Done as suggested but same error comes

 

Hi Softflow,
I don't know if you've solved your issues since Tuesday. I just noticed that you had some typing errors in the config that you posted above.

Specifically the underlined line:

#DriverClass=com.mysql.jdbc.Driver
#JdbcUrl=jdbc:mysql://192.168.2.110/test?characterEncoding=utf8
#SQL Server
riverClass=net.sourceforge.jtds.jdbc.Drive
JdbcUrl=jdbc:jtds:sqlserver://198.68.2.105/testdata

Should read DriverClass=net.sourceforge.jdts.jdbc
or DriverClass=net.sourceforge.jdts.jdbc.Driver

I don't know if it was in copying it here that you introduced this error but if you have that on your machine then it would definitely spew errors.

-Fifi

 

Here's a short tutorial for anyone that wants to run the RDC server on a Ubuntu server and:

• Auto start the RDC server when the (Ubuntu) server boots.
• Be able to start / restart / stop the RDC server, without the need to reboot the Ubuntu server.

First take a look at this page: Running a Java program as a daemon in Ubuntu Linux, it contains all the info you need but to save you time i'll provide an 'almost ready to run' script...

My script assumes that you have the RDC files installed in your home directory in a sub-directory named b4a-rdc.
For example the complete path to the config.properties file might be:
/home/martin/b4a-rdc/config.properties


This is the script, it's named b4a-rdc.sh:

PHP:

#!/bin/sh
### BEGIN INIT INFO
# Provides:  b4a-rdc
# Required-Start:  $local_fs $remote_fs $network $syslog
# Required-Stop:  $local_fs $remote_fs $network $syslog
# Default-Start:  2 3 4 5
# Default-Stop:  0 1 6
# X-Interactive:  true
# Short-Description: Start/stop b4a-rdc server
### END INIT INFO
cd /home/<USERNAME>/b4a-rdc
case $1 in
  start)
  echo "Starting b4a-rdc..."
  if [ ! -f /tmp/b4a-rdc-pid ]; then
  nohup java -Xmx256m -cp .:/home/<USERNAME>/b4a-rdc/libs/*:/home/<USERNAME>/b4a-rdc/jdbc_driver/* anywheresoftware.b4a.remotedatabase.RemoteServer /home/<USERNAME>/b4a-rdc 2>> /dev/null >> /dev/null &
  echo $! > /tmp/b4a-rdc-pid
  echo "b4a-rdc started..."
  else
  echo "b4a-rdc is already running..."
  fi
  ;;
  stop)
  if [ -f /tmp/b4a-rdc-pid ]; then
  PID=$(cat /tmp/b4a-rdc-pid);
  echo "Stopping b4a-rdc..."
  kill $PID;
  echo "b4a-rdc stopped..."
  rm /tmp/b4a-rdc-pid
  else
  echo "b4a-rdc is not running..."
  fi
  ;;
  restart)
  if [ -f /tmp/b4a-rdc-pid ]; then
  PID=$(cat /tmp/b4a-rdc-pid);
  echo "Stopping b4a-rdc...";
  kill $PID;
  echo "b4a-rdc stopped...";
  rm /tmp/b4a-rdc-pid
  echo "Starting b4a-rdc..."
  nohup java -Xmx256m -cp .:/home/<USERNAME>/b4a-rdc/libs/*:/home/<USERNAME>/b4a-rdc/jdbc_driver/* anywheresoftware.b4a.remotedatabase.RemoteServer /home/<USERNAME>/b4a-rdc 2>> /dev/null >> /dev/null &
  echo $! > /tmp/b4a-rdc-pid
  echo "b4a-rdc started..."
  else
  echo "b4a-rdc is not running..."
  fi
  ;;
esac


So you need to:

• Ensure that all RDC files are located in your user directory in a sub-directory named b4a-rdc.
• Perform a search and replace in the script, replacing <USERNAME> with your username.
• Save the script and upload it to the directory b4a-rdc.
  Be careful when saving the script, it must be saved with UNIX style line endings and NOT Windows style line endings.
  Do not copy/paste the above script included in this post - you're likely to get problems with line endings, instead download the attached script.
• Move the script to the system init.d directory:
  
  PHP:

  sudo mv /home/<USERNAME>/b4a-rdc/b4a-rdc.sh /etc/init.d/b4a-rdc
• Make the script executable:
  
  PHP:

  sudo chmod +x /etc/init.d/b4a-rdc
• Add the script to your system startup scripts:
  
  PHP:

  sudo update-rc.d b4a-rdc defaults

You can now run these commands to control the RDC server:

• sudo /etc/init.d/b4a-rdc start
• sudo /etc/init.d/b4a-rdc stop
• sudo /etc/init.d/b4a-rdc restart

And of course the RDC server will be started automatically when your server starts.

If you want to locate your RDC files elsewhere then the script will still work as long as you update all occurrences of /home/<USERNAME>/b4a-rdc with the full path to the directory containing the RDC files.
Do not modify /tmp/b4a-rdc-pid, if you modify this then you'll likely find that the script fails to start.

Martin.

 

Thanks FIFi
I made a mistake in my config file but still it is giving error as follows even though the jtds.1.3.jar is present.

Jan 21, 2014 10:06:07 PM com.mchange.v2.c3p0.DriverManagerDataSource ensureDrive
rLoaded
WARNING: Could not load driverClass net.sourceforge.jtds.jdbc.Drive
java.lang.ClassNotFoundException: net.sourceforge.jtds.jdbc.Drive
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:190)
at com.mchange.v2.c3p0.DriverManagerDataSource.ensureDriverLoaded(Driver
ManagerDataSource.java:112)
at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManag
erDataSource.java:144)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnecti
on(WrapperConnectionPoolDataSource.java:195)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnecti
on(WrapperConnectionPoolDataSource.java:184)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionRe
sourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:200)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResource
Pool.java:1086)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPe
ndingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1073)
at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourc
ePool.java:44)
at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.ru
n(BasicResourcePool.java:1810)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(Thre
adPoolAsynchronousRunner.java:648)
Jan 21, 2014 10:06:08 PM com.mchange.v2.resourcepool.BasicResourcePool$Scattered
AcquireTask run
WARNING: com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@15b1
b88 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to
acquire a needed new resource, we failed to succeed more than the maximum number
of allowed acquisition attempts (30). Last acquisition attempt exception:
java.sql.SQLException: Network error IOException: Connection refused: connect
at net.sourceforge.jtds.jdbc.JtdsConnection.<init>(JtdsConnection.java:4
36)
at net.sourceforge.jtds.jdbc.Driver.connect(Driver.java:184)
at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManag
erDataSource.java:146)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnecti
on(WrapperConnectionPoolDataSource.java:195)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnecti
on(WrapperConnectionPoolDataSource.java:184)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionRe
sourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:200)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResource
Pool.java:1086)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPe
ndingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1073)
at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourc
ePool.java:44)
at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.ru
n(BasicResourcePool.java:1810)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(Thre
adPoolAsynchronousRunner.java:648)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketI
mpl.java:79)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.ja
va:339)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocket
Impl.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 net.sourceforge.jtds.jdbc.SharedSocket.createSocketForJDBC3(SharedSoc
ket.java:288)
at net.sourceforge.jtds.jdbc.SharedSocket.<init>(SharedSocket.java:251)
at net.sourceforge.jtds.jdbc.JtdsConnection.<init>(JtdsConnection.java:3
31)

 

I am giving the reference of Java 7 directory in RunRlc.bat

 

There was an error in config.properties that i changed which was wrong. But the problem still persists