Eclipse tomcat does not start – May be locked by another process.

Happy Western New Year 2019!

I had a single spring web project. It became too big over the day. I had to split it up into multiple reusable projects so that I can build APIs. After I split it, Tomcat refused to start with the following error.

Publishing failed with multiple errors
Could not delete D:/Pandian/Documents/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp1/wtpwebapps/crm-upload/WEB-INF/lib. May be locked by another process.
Could not delete D:/Pandian/Documents/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp1/wtpwebapps/crm-upload/WEB-INF. May be locked by another process.

I tried to clean work folder, It doesn’t work. I did the following sequence to resolve this.

  1. Remove the tomcat server from eclipse server tab
  2. Restart Eclipse
  3. Add a new tomcat server
  4. Start the project



No Spring WebApplicationInitializer types detected on classpath

Wah, what a stupid error it was!

My Spring web app, which was running smoothly, refused to start. I don’t find any logs in log4j or tomcat log. Only clue I had was –

No Spring WebApplicationInitializer types detected on classpath

Here is how I solved it –

  1. Stop the tomcat
  2. Clean and build all eclipse projects
  3. Goto server tab and select the tomcat server. Press clean. Press clean work directory.
  4. Right click on the tomcat and remove it.
  5. Delete the tomcat from the eclipse run times
  6. Add tomcat server to the eclipse servers again
  7. Start the application


Integrating Apache and Tomat with mod_jk

This post is a continuation of my previous post. In this post I’ll tell you what I did to access my tomcat apps via Apache.

All the files you edit here are very crucial. Take a backup and make a note of the changes you do. Otherwise, it may goof your Apache configuration.

Installing mon-jk library

$ sudo apt-get install libapache2-mod-jk

Make sure the AJP redirect port is enabled on tomcat/config/server.xml

<Connector port=”8009″ protocol=”AJP/1.3″ redirectPort=”8443″ />

Create a new worker file

sudo vi /etc/apache2/

# Define 1 real worker using ajp13
# Set properties for worker (ajp13)

Reconfigure jk.conf

Change the JkWorkersFile property to /etc/apache2/

sudo vi /etc/apache2/mods-available/jk.conf

# JkWorkersFile /etc/libapache2-mod-jk/
JkWorkersFile /etc/apache2/

Configure the URL Apache should pass through the Tomcat

sudo vi /etc/apache2/sites-enabled/000-default

and add the line starts with JKMount in your configurtation

<VirtualHost *:80>
JkMount /gplus* worker1
</VirtualHost *:80>

Restart apache

I found http://<apacheIP>/gplus worked.

Appreciations and thanks to






Apache – Tomcat connector in Windows

This is another interesting assignment completed today. Though our CRM portal is no so busy, we want to in a robust infra. There are series of new releases available kn the market. JDK 7, Tomcat 7 etc. Previously the application was using tomcat itself as a web server. This is a risky situation since I expose the complete applivation to public. Hence I have installed the apache as web front-end and tomcat 7 as middleware.

Here is the procedure:

mod_proxy_ajp would be the easiest to use if you are using Apache 2.2. It is part of the Apache distribution so you don’t need to install any additional software.

In your httpd.conf you need to make sure that mod_proxy and mod_proxy_ajp are loaded:

LoadModule proxy_module modules/
LoadModule proxy_ajp_module modules/

Then you can use the ProxyPass and ProxyPassReverse directives as follows:

ProxyPass /portal ajp://localhost:8009/portal
ProxyPassReverse /portal ajp://localhost:8009/portal

As simple as that.

java.lang.NoSuchMethodError while starting tomcat 7 from Eclipse

My tomcat 7 server is starting and working fine by itself. When I stop it and try to start from Eclipse, it gives a NoSuchMethodError which aborts the server starting.

java.lang.NoSuchMethodError: org.eclipse.wst.server.core.model.ServerBehaviourDelegate.getTempDirectory(Z)Lorg/eclipse/core/runtime/IPath;

somebody is getting same error, but still not resolved.

I have raised a bug report to eclipse. Lets see.


I just got an update from Eclipse Bugzilla

Your Build Identifier indicates you are using Eclipse 3.5, which only works
with WTP 3.1.x.  WTP 3.2.x, which includes the new Tomcat 7.0 support, requires
Eclipse 3.6.x.  Running WTP 3.2.x with Eclipse 3.5.x is not supported.  You
will have to install Eclipse 3.6 since upgrading 3.5.x to 3.6 is not supported.
Once you have Eclipse 3.6 with WTP 3.2.x installed (using the Java EE package
is the easiest) you can create a new workspace and import your existing
projects, or you can simply open old workspace.  If you open the old workspace
with Eclipse 3.6 and WTP 3.2.x, using that workspace with Eclipse 3.5 and WTP
3.1.x is not supported.

Since Eclipse 3.5.x and WTP 3.2.x is not a supported combination, I’m marking
this bug as invalid.

Upgrade karega!

Target runtime Apache Tomcat v6.0 is not defined

I was upgrading the tomcat in my eclipse from version 6 to 7. Servers were added, old servers were removed. Tomcat 6 installed. But the server is not starting because of the following error.

Target runtime Apache Tomcat v6.0 is not defined.    <project name>        Unknown    Faceted Project Problem

It keeps my old server entry for the project.

We need to right click on the project, properties and Targeted Runtimes. Uncheck the old entry and enable the new entry. This should solve this error.

Targeted Runtimes

Targeted Runtimes

Still server is facing some other issue. Need to check up.