Java Performance Tuning

Oracle Technetwork article on gc tuning
Memory leaks in Java

java
-Dcom.sun.management.jmxremote
-Dcom.sun.management.jmxremote.port=9000
-Dcom.sun.management.jmxremote.authenticate=false
-Dcom.sun.management.jmxremote.ssl=false
-agentlib:hprof=heap=dump,file=/tmp/hprof.bin,
format=b,depth=10
-jar java_app.jar

use jconsole from JDK 6

Ssh Port forwarding

SSH port-forwarding can allow secure access to remotehost/remoteport even if firewalls don't allow a direct connection; as long as we can access an ssh-server that has access to the remotehost/remoteport.

ssh -f -L localport:remotehost:remoteport hostname tail -f /dev/null

ssh-server must be running on hostname and hostname must be able to connect to remoteport and remotehost.

Branch vs Trunk based development

Branching to develop new features is a common practice with large software development efforts. This has several drawbacks - primarily it prevents refactoring because merges become a huge problem, as suggested here. An alternative is the notion of "branch by abstraction" - where everyone works on the trunk but features can be turned on/off.

Versioning in RESTful Web services

Two kinds of versioning: Data versioning vs schema(language) versioning
Langage versioning should be forward-compatible - not require existing clients to change their implementation. See Tag recommendations
Options from Stu Charlton
- version in content
- versions in URI
- versions in MIME-type http header