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How to upgrade Eclipse Platform itself

For Eclipse 4.2 and above Steps:  you first need to add the new release's repository as follows: Window > Preferences > Install/Update > Available Software Sites Click 'Add' Enter the URL of the new repository (for example, http://download.eclipse.org/releases/luna/  for Luna and Eclipse 4.4) Click 'Ok' Help > Check for Updates If updates are found, proceed through the install wizard and click Finish at the end If upgrading the platform itself, when you are prompted to restart it is strongly recommended to do so. A restart may not be required when updating other features, but always select to restart if you are unsure. Check your Available Software Sites for release-specific update sites that may need updating as well, e.g.  The Eclipse Project Updates  URL changes with each release (typically release-specific sites hold the SDK/Source features and off-cycle hot fixes and are not required)

Xcode Delete and Duplicate Selected Lines

Xcode Delete and Duplicate Selected Lines step 1:  sudo -i vi /Applications/Xcode.app/Contents/Frameworks/IDEKit.framework/Versions/A/Resources/IDETextKeyBindingSet.plist step 2: put below near the end of the file <key>Customized</key> <dict> <key>Delete Line</key> <string>selectLine:, deleteBackward:</string> <key>Duplicate Lines</key> <string>selectLine:, copy:, moveToEndOfLine:, insertNewline:, paste:, deleteBackward:</string> <key>Duplicate Current Line</key> <string>moveToBeginningOfLine:, deleteToEndOfLine:, yank:, insertNewline:, moveToBeginningOfLine:, yank:</string> </dict> step3 : restart xCode step4: config your  xCode keyboard shortcuts 

error while opening eclipse

When i open it, it says: an error has occurred, see ...\workspace\.metadata\.log I got message “Caused by: org.eclipse.core.internal.dtree.ObjectNotFoundException: Tree element 'xxxx.class' not found.” solution: Delete the file .metadata/.plugins/org.eclipse.core.resources/.snap

DCEVM - A JRebel free alternative

In tomcat project, we have to restart the server whenever there is even tiny change made. DCEVM is really helpful. http://ssw.jku.at/dcevm/ or https://github.com/dcevm/dcevm How? Step 1: download the jar  file https://dcevm.github.io/ Step 2: Attach the dcevm to your existing JDK/JVM Step3: in your eclipse,  added below to the Arguments of Tomcat configuration  -XXaltjvm=dcevm