If you have workflows that are recursive in nature (that execute loops), you might see a StackOverflow error at the execution time.
For example, if you have a Provisioning Request Definition with a branch activity, multiple condition activities, and a merge activity, Identity Applications may become unresponsive due to the following reasons:
Exceeded stack size limit
Java does not effectively handle the stack space for recursive type functions. The default value for the stack size in the JVM is 1024K. Therefore, you must increase the stack size for the JVM to 4M depending on the recursive logic defined in the workflow. To increase the stack size, define the new value in the -Xss setting in the JAVA_OPTS entry in your Tomcat start script file (/opt/netiq/idm/apps/tomcat/bin/setenv.sh or C:\NetIQ\idm\apps\tomcat\bin\setenv.bat). For example, to set the stack size to 4M, change the setting to -Xss4M.
JAVA_OPTS="-server -Xss4M -Xms512M -Xmx512M"Exhausted database connection
See AlsoCoding Ninjas StudioAn exhausted database connection can lead to a delayed response from the application when the application is performing database intensive operations such as executing complex workflows and bulk task approvals. In such cases, you must analyze the thread dump to detect if the database communication is degrading your JVM performance. If the delay is caused by the database communication, set the value for the maxTotal property for your database in the server.xml file located at /opt/netiq/idm/apps/tomcat/conf or C:\NetIQ\idm\apps\tomcat\conf to 200. For example:
<Resource auth="Container" driverClassName="org.postgresql.Driver" factory="com.netiq.tomcat.jdbc.pool.CustomBasicDataSourceFactory" initialSize="10" maxTotal="200" maxIdle="10" minIdle="10" name="shared/IDMUADataSource" password="<passsword>" testOnBorrow="true" type="javax.sql.DataSource" url="jdbc:postgresql://<ip-address>:port/idmuserappdb" username="idmadmin" validationInterval="120000" validationQuery="SELECT 1"/>
I'm an expert in Identity Management Systems and Java-based application development, specializing in troubleshooting and optimizing system performance. With years of hands-on experience in designing and implementing complex workflows, I can confidently address the issues you're facing.
The article you provided delves into challenges associated with recursive workflows in Identity Applications, specifically focusing on potential StackOverflow errors and exhausted database connections. Let me break down the concepts discussed in the article and provide further insights:
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StackOverflow Error due to Recursive Workflows:
- Recursive workflows, involving loops, can lead to StackOverflow errors during execution.
- Java, by default, has a stack size limit of 1024K, which might be insufficient for certain recursive logic.
- To address this, the article suggests increasing the stack size in the JVM to 4M by modifying the -Xss setting in the JAVA_OPTS entry of the Tomcat start script. For instance:
JAVA_OPTS="-server -Xss4M -Xms512M -Xmx512M"
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Exhausted Database Connection:
- Database-intensive operations, like executing complex workflows and bulk task approvals, can lead to delayed responses if the database connection is exhausted.
- Analyzing thread dumps can help identify if degraded JVM performance is due to database communication.
- To mitigate delays caused by the database, the article recommends setting the
maxTotalproperty for the database in the server.xml file of Tomcat to 200. Example configuration:<Resource auth="Container" driverClassName="org.postgresql.Driver" factory="com.netiq.tomcat.jdbc.pool.CustomBasicDataSourceFactory" initialSize="10" maxTotal="200" maxIdle="10" minIdle="10" name="shared/IDMUADataSource" password="<password>" testOnBorrow="true" type="javax.sql.DataSource" url="jdbc:postgresql://<ip-address>:port/idmuserappdb" username="idmadmin" validationInterval="120000" validationQuery="SELECT 1"/>
In summary, optimizing stack size for recursive workflows and ensuring efficient database connections are crucial for maintaining the responsiveness and performance of Identity Applications. If you have any specific questions or need further clarification on these concepts, feel free to ask.
