Error starting the SOA Suite

I tried starting the Oracle SOA Suite from the command prompt,
${SOA_HOME}opmn\bin>opmnctl.exe startall

But, I got an error as under,

opmnctl: starting opmn and all managed processes...
================================================================================
opmn id=localhost:6200
2 of 3 processes started.

ias-instanceid=oracleAS++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
ias-component/process-type/process-set:
default_group/oc4j_soa/default_group/

Error
--> Process (index=1,uid=936119581,pid=5296)
failed to start a managed process after the maximum retry limit
Log:
C:\SOA\product\10.1.3.1\OracleAS\opmn\logs\\default_group~oc4j_soa~default_group~1.log

After doing some research, I found that this is caused due to improper shutdown of the SOA suite. Some of the locks (JMS locks, DB locks ) are not released which needs to be manually removed from the file system.

Navigate to ${SOA_HOME}\j2ee\{OC4J Instance Name}\persistence and remove all the files.

Now start the SOA suite and it should work.