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Tomcat 7 - Ignoring db conections pool parameters (DBCP)


Tomcat 7 - Ignoring db conections pool parameters (DBCP)

By : surag m
Date : October 25 2020, 07:10 PM
may help you . Add values also for maxConnLifetimeMillis
code :
validationQuery="SELECT 1 FROM DUAL"


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org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot get a connection, pool error Timeout waiting for idle object

org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot get a connection, pool error Timeout waiting for idle object


By : Man Yum
Date : March 29 2020, 07:55 AM
Hope this helps what are you connection pool settings can you post whats in DBController? Tip: db.terminate() should be in finally{} block, may be you are lossing connections on exceptions.
Update: Posting some of the modifications that might help you, but DO CLEAN UP THE CODE for maintenance sake. Look for comments where changes have been made.
code :
public class DBController {
private DataSource ds;
private Connection con;// NEW CHANGE

public void setUp() throws NamingException{
    //connect to database
    Context ctx = new InitialContext();
    ds = (DataSource)ctx.lookup("java:comp/env/jdbc/it2299");
    con = ds.getConnection(); // NEW CHANGE
}

public ResultSet readRequest(String dbQuery){
    ResultSet rs=null;
    try{
        //REMOVED CODE FROM HERE
        Statement stmt = con.createStatement();
        rs = stmt.executeQuery(dbQuery);
    }
    catch(Exception e){e.printStackTrace();}
    return rs;
}

public int updateRequest(String dbQuery){
    int count=0;
    try{
        //REMOVED CODE FROM HERE
        Statement stmt = con.createStatement();
        count=stmt.executeUpdate(dbQuery);
    }
    catch(Exception e){e.printStackTrace();}
    return count;
}

public void terminate(){
    try {con.close();}
    catch(Exception e){e.printStackTrace();}
}
}
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot get a connection, pool error Timeout waiting for idle object?

org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot get a connection, pool error Timeout waiting for idle object?


By : user5816497
Date : March 29 2020, 07:55 AM
Does that help i have just found the solution as i have never closed the connection object after execution of query.i have done as follows which works for me after try catch block...
code :
finally {
             try {
                 if(CtxObj!=null)   {
                     CtxObj.close();
                    }
                    if(sStmtObj!=null){
                        sStmtObj.close();
                    }
                    if(ConObj!=null){
                        ConObj.close();
                    }
            } catch (NamingException e) {
                // TODO Auto-generated catch block
                log.info(e);
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                log.info(e);
            }
        }
Grails Commons DBCP Pool vs. Tomcat JDBC Pool

Grails Commons DBCP Pool vs. Tomcat JDBC Pool


By : Agus Syahirul Albab
Date : March 29 2020, 07:55 AM
With these it helps The Commons DBCP pool is very good, but the Tomcat pool is more flexible and has higher performance. The initial blog posts from tomcatexpert.com are a bit dated, but should still be very relevant and if anything the numbers should be better now: http://www.tomcatexpert.com/tags/connection-pool
Note that in 2.3 we've replaced Commons DBCP with Tomcat JDBC, so it makes sense to start using it now.
java.lang.ClassCastException: org.apache.tomcat.dbcp.dbcp.BasicDataSource cannot be cast to org.apache.tomcat.jdbc.pool.

java.lang.ClassCastException: org.apache.tomcat.dbcp.dbcp.BasicDataSource cannot be cast to org.apache.tomcat.jdbc.pool.


By : chandra shekher
Date : March 29 2020, 07:55 AM
I wish this help you I'm running Tomcat 7.0.22 and I wrote a simple servlet that connects to a SQL Anywhere 12.0 database. When I run the servlet I get java.lang.ClassCastException: org.apache.tomcat.dbcp.dbcp.BasicDataSource cannot be cast to org.apache.tomcat.jdbc.pool.DataSource. My ./META-INF/content.xml file looks like the following: , In my case I just forgot to put:
How to track/log connections in tomcat dbcp pool and detect code that does not return connection to the pool

How to track/log connections in tomcat dbcp pool and detect code that does not return connection to the pool


By : Michael M
Date : March 29 2020, 07:55 AM
I wish this help you Logging connection borrowing and returning
I asked this question to provide my own answer. Probably not a lot of people have this problem, but it was a real challenge tracking down the code the left the connections open. I have put together the solution described here in a small github project: https://github.com/chronakis/dbcp-conn-log. You can go there or continue for a short description here.
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