Stored Proc accessing remote db: works locally, fails once uploaded!
Hi Everybody,
My servlet can access a remote stored procedure on our server when running on the local machine, as soon as I upload it and try to run the servlet on the server I get the following error when trying to access the stored procedure:
500 Servlet Exception
java.lang.NullPointerException
at com.mysql.jdbc.StringUtils.indexOfIgnoreCaseRespectQuotes(StringUtils.java:948)
at com.mysql.jdbc.DatabaseMetaData.getCallStmtParameterTypes(DatabaseMetaData.java:1255)
at com.mysql.jdbc.DatabaseMetaData.getProcedureColumns(DatabaseMetaData.java:3640)
at com.mysql.jdbc.CallableStatement.determineParameterTypes(CallableStatement.java:506)
at com.mysql.jdbc.CallableStatement.<init>(CallableStatement.java:401)
at com.mysql.jdbc.Connection.parseCallableStatement(Connection.java:4072)
at com.mysql.jdbc.Connection.prepareCall(Connection.java:4146)
at com.mysql.jdbc.Connection.prepareCall(Connection.java:4120)
at core.TwistedDBC.TestSP(TwistedDBC.java:208)
core.TwistedDBC.TestSP(TwistedDBC.java:208) bieng the following line of code:
208: CallableStatement cStmt = con.prepareCall("{call Test(?)}");209: cStmt.registerOutParameter(1, Types.INTEGER);The line of code I'm using to connect is:
207: con = DriverManager.getConnection("jdbc:mysql://SERVER-NAME/SERVLET-NAME?noAccessToProcedureBodies=true", USERNAME, PASS);I set noAccessToProcedureBodies=true because we are on shared hosting with a Virtual JVM and I don't have rights to grant permissions.
I thought that I may have been able to execute the procedure as localhost, but when I ran "SHOW PROCESSLIST" from the local version of my servlet it displayed that I'm connecting via my ISP's IP address. When I did the same for the Remote version it displayed that it was using the IP address of my hosting company.
So, when my local version of the servlet (http://127.0.0.1:8084/Servlet-war/Servlet)runs, it returns "8" which is correct, but upload all the files to the remote server (http://myserver.com/Servlet-war/Servlet) and I get that error when trying to run from the url.
Any clues, thanks.
Seems likely that there is a bug in the driver.
Probably a rather exotic one since it seems likely that others have been able to use procs with MySQL.
Some debugging notes
1. Are you sure that the driver version on your local box is the same as that of the server? There is a meta data method(s) to determine that.
2. Have you verified the code that you are looking at is the same as what is running?
3. Try making an explicit statement (get rid of the '?') to see if it works.
4. Are you using the latest released driver version?
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