Administration, troubleshooting, and performance tuning in Weblogic

Server Lifecycle Management:

# Start Admin Server

$DOMAIN_HOME/startWebLogic.sh  # Unix

%DOMAIN_HOME%\startWebLogic.cmd  # Windows

# Start Managed Server

$DOMAIN_HOME/bin/startManagedWebLogic.sh <server_name> <admin_url>

# Graceful stop

$DOMAIN_HOME/bin/stopWebLogic.sh  # Admin

$DOMAIN_HOME/bin/stopManagedWebLogic.sh <server_name> t3://admin_host:port

Force Kill (if hung):

kill -9 $(pgrep -f "weblogic.Name=<server_name>")  # Unix

taskkill /F /PID <pid>  # Windows

Deployment Commands:

WLST (WebLogic Scripting Tool):

# Deploy app

deploy('my_app', '/path/to/app.ear', targets='AdminServer')

# List deployments

ls('/AppDeployments')

# Undeploy

undeploy('my_app', targets='AdminServer')

Command-Line (weblogic.Deployer):

java weblogic.Deployer -adminurl t3://localhost:7001 -deploy /path/app.war

Log Inspection:

Tail Logs in Real-Time

tail -f $DOMAIN_HOME/servers/AdminServer/logs/AdminServer.log

Search for Errors:

grep -i "ERROR" $DOMAIN_HOME/servers/*/logs/*.log

Thread Dump Generation:

kill -3 <weblogic_pid>  # Unix (creates dump in stdout/logs)

jstack <pid> > thread_dump.txt  # Alternative

JDBC & DataSource Diagnostics

Test Connection Pool

java weblogic.Admin -url t3://localhost:7001 -username weblogic -password <pwd> \TESTPOOL myDataSource

Reset Connection Pool (WLST)

connect('weblogic','password','t3://localhost:7001')

cd('/JDBCSystemResources/myDS/JDBCResource/myDS/JDBCDriverParams/myDS')

cmo.reset()