Posts tagged "Livecycle"

LDAP: error code 12 – Unavailable Critical Extension

The issue LDAP: error code 12 – Unavailable Critical Extension commonly occurs when asking an LDAP Server to return paged results but the LDAP doesn’t support the PagedResultsControl extension.

  • SunOne 5.2 and 6.3 don’t support PagedResultsControl extension.
  • Active Directory and other LDAP servers support PagedResultsControl extension.

Working of pagination during LiveCycle sync from an LDAP server
In LiveCycle, users and groups are synched from an LDAP server in batches of 200.
When the results returned from an LDAP server is >= 200, then an AutoDetectionLogic is automatically enabled.
This AutoDetectionLogic seeing that the LDAP server is SunOne, automatically disables paging.
This AutoDetectionLogic seeing that the LDAP server is AD or non-SunOne, automatically enables paging.

Issue
There have been cases where an Enterprise has a proxy server in between which acts as Active Directory but the ultimate LDAP server running behind is SunOne.
In such a scenario, the AutoDetectionLogic is forced to enable paging because of the proxy server acting as Active Directory.
Hence, when the communication ultimately happens with SunOne, we get the error and sync fails.

Fix
In such a scenario, the AutoDetecitonLogic has to be turned off so that LiveCycle doesn’t send any pagination requests.
One should follow the steps mentioned below to disable paging permanently.

  • Login to AdminUI with administrator credentials.
  • Navigate to Home > Settings > User Management > Configuration > Manual Configuration
  • Export the config.xml to file system.
  • Look for the tag entries starting with <entry key=”enablePaging” value=”…
  • This entry is present under nodes named LDAPUserConfig and LDAPGroupConfig for a particular Enterprise or Hybrid domain.
  • By default the entry is <entry key=”enablePaging” value=”true”/>
  • When using SunOne as LDAP, this entry should be modified to <entry key=”enablePaging” value=”false”/>
  • Save the config.xml and import it back to LiveCycle.
  • No restart of the Application server required.

Using JMX-Console for configuring and debugging LiveCycle applications

 JMX-Console ??

JMX(Java Managed Extensions) is a Java Technology which provides a way to manage running applications via various utilities and tools.
The running services are registered as mbeans and can be accessed/controlled remotely via JMX-Console.

LiveCycle currently supports 3 App Servers namely, JBoss, Weblogic and Webspehere.
While Weblogic and Websphere don’t provide a UI to connect to JMX managed bean instances,
Jboss provides a management console called JMX-Console to do the same.
In order to manage beans for Weblogic and Websphere,
Java provides a generic Utility called JConsole which can be connected to any running Application Server and relevant tasks can be performed.

Why JMX-Console

  • There are times when server gets stuck at some error, e.g. Server goes into hang state. In such cases, needs arises to get an insight into the running system so that the issue can be narrowed down.
  • At times one would like to get some information about the registered LiveCycle service, e.g. some metadata, some server information, some kernel information.
  • Sometimes one needs to change some settings in the server at run time.
  • One may need to redeploy a web application.
  • One might need to change the logging level for a particular service or decrease the verbosity of the logs.
  • Most of these changes mandate restarting of the server which can be very tardy with a LiveCycle bundled with too many components.
  • There are times when the host machine is not accessible directly to debug the issue.

Some benefactions of JMX-Console for debugging LiveCycle issues

I’ll be discussing about the following topics that can be helpful while debugging a LiveCycle application/service.
a. Login into JMX-Console
b. Redeploying a LiveCycle war
c. Configuring the log levels for a specific package
d. Generating Thread Dump
e. Stopping LiveCycle Server Instance
f. Starting/Stopping the CRX server
g. Command line JMX management

NOTE: the changes made on JMX-Console remain active till the server is running and vanish once the server is restarted.

Login into JMX-Console

Redeploying a LiveCycle web service

Whenever one needs to change some settings in a war, Jboss doesn’t allow to do so until the server is stopped.
Of course, one can always copy the war/ear outside and edit and then hotswap with the existing running war.
But the following seems like a safe and graceful way to modify a war without shutting down the whole running LiveCycle server.

  • Navigate to http://LCServer:LCPort/jmx-console
  • Under the section “Object Name Filter”, click on the link named jboss.web.deployment
  • To the right hand side under the section jboss.web.deployment, there will be a listing of context-roots to which various wars are associated.
  • Click on the context-root which that is associated with the concerned war.
  • This will open the JMX Mbean view of the associated war.
  • The mbean names are of format “war=/context_root_associated_with_war”.
  • Now one can simply start/stop/redeploy the war by clicking on the related “Invoke” button.

Configuring log levels for package(s)

The log levels for a package are changed in Jboss via log4jService located at, \\Jboss\server\server_instance\conf\jboss-log4j.xml.
Or by changing the log4j.properties located in a particular war.
JMX-Console provides a remote way of doing the same.

  • Navigate to http://LCServer:LCPort/jmx-console
  • Under the section “Object Name Filter”, click on the link named jboss.system
  • Then click on link service=Logging,type=Log4jService under the section “jboss.system” on the right hand side.
  • There are various settings one can alter for logging as per need.
    • Custom Logging File – As pointed out before, the log4J settings are controlled via the file named jboss-log4j.xml.
      One can even change the settings of the server to point to a custom made logging.xml file.
      Replace the value of the attribute named “ConfigurationURL” from “resource:jboss-log4j.xml” to the custom logging.xml file.
      The custom file however needs to be placed at the same location alongside the jboss-log4j.xml.
    • Get specific Log Level details – Have a look at the jboss-log4j.xml.
      It consists of tags named “categories” with different priority values.
      In Log4j world, the category is called “Logger” and the priority value is called the “Log Level”.
      If one wants to know the log level for a particular category specified in the jboss-log4j.xml,
      then enter the name of the Logger for the Operation named “getLoggerLevel” and click on the Invoke button.
    • Set/Edit new Logger and Log level – One can create new Categories/Logger on the fly and associate a particular package with a Log Level.
      Enter the name of the Logger and the Log Level for the Operation named “setLoggerLevel” and click Invoke.
      Till the server instance is up and running, the log level for the particular package will remain active.
    • Set/Edit multiple Loggers and Log level – One can also set multiple Loggers with a particular Log Level under the Operation named “setLoggerLevels”.
    • Reconfigure Logging – If the logging is not getting reflected for some unknown reason,
      then click on Invoke button for the Operation named “reconfigure”.
      This is analogous to editing of a jboss-log4j.xml where the saving the changes the logging is reconfigured.
    • Edit root threshold Log level – When no Categories are specified then the Log level of Root takes control.
      This is specified under as the value for the attribute named “DefaultJBossServerLogThreshold”.
      Change the value to a required level and click on “Apply Changes”.
      This will activate the Log Level for all those packages which don’t have a category explicitly specified.

Generating Thread Dump

A Java thread dump is a way of finding out what every JVM thread is doing at a particular point in time.
This is very helpful in cases where the server has become unresponsive or went into an unexplained hang state.
Thread Dump allows one to get an insight into the failing JVM process.
As an analysis of the dump, it can be known where exactly the threads are stuck.

  • In order to get the Thread Dump via JMX-Console,Navigate to http://LCServer:LCPort/jmx-console
  • Under the section “Object Name Filter”, click on the link named jboss.system
  • Then click on link type=ServerInfo under the section “jboss.system” on the right hand side.
  • Click on Invoke button of the “listThreadDump” operation to generate the ThreadDump.
  • The Thread Dump can then be saved to the file system for analysis.

Stopping LiveCycle Server Instance

The JBoss server instance can be stopped online via JMX-Console.
Especially useful when one doesn’t have direct access to the host machine.
i. Navigate to http://LCServer:LCPort/jmx-console
ii. Under the section “Object Name Filter”, click on the link named jboss.system
iii. Then click on the link type=Server under the section jboss.system on the right hand side.
iv. Click on Invoke button of the “shutdown” operation to shutdown the server instance.

Starting/Stopping the CRX server

Have a look at second section of the blog entry, http://blogs.adobe.com/apugalia/restarting-crx-server-without-stopping-a-jboss-server-instance/

Twiddle
While JMX-Console provides UI way of debugging and changing the settings,
the same can be achieved through command line by another utility named twiddle that comes bundled with Jboss and is located in the bin folder of the same.
It can perform every task that a JMX-Console can do through UI.
I found a nice article depicting the usage of Twiddle with examples. Have a look at,
http://weblogic-wonders.com/weblogic/2011/02/13/twiddle-utility-examples/

Note: The JMXConosle.war is not shipped with the turnkey installations previous to LC ES3.
In such cases, it needs to be downloaded and deployed to the deploy folder of the related Server_Instance.

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Customizing ports on Jboss for running multiple server instances

Many a times we need to run multiple JBoss server instances on the same sever, e.g. Vertical Cluster setups. At times when some other application has taken control of port 8080, then need arises to switch JBoss server instance to run on some other port.

Below mentioned are the ways one can follow to configure different ports on multiple JBoss server instances without going for changing 10s of ports which is firstly time consuming and also hard to maintain.

Jboss 4.x.x

JBoss by default uses 8080 for Http connection and 8443 for SSL connection.

So, in case one needs to switch port 8080 and it’s set of related ports of a server instance to something else, then Jboss provides another set of 3 pre-configured ports to choose from, i.e. 8180, 8280, 8380.

To change the default port settings,
a. Go to \\Livecycle_Installation\JBoss\server\Server_Instance_Name\conf\jboss-service.xml
b. Look for the following mbean instance:

<mbean code=”org.jboss.services.binding.ServiceBindingManager” name=”jboss.system:service=ServiceBindingManager”>
<attribute name=”ServerName”>ports-01</attribute>
<attribute name=”StoreURL”>${jboss.home.url}/docs/examples/binding-manager/sample-bindings.xml</attribute>
<attribute name=”StoreFactoryClassName”>org.jboss.services.binding.XMLServicesStoreFactory</attribute>
</mbean>

c. The above mentioned mbean code, is commented by default to allow users to use 8080.
Uncomment the above said mbean code and the server instance will be ready to run on ports-01, which is 8180.
This also take care of the other related ports and increment their value with 100, i.e. SSL port related to ports-01 will be 8543.

If one wants to use any other port. Just change the value for the attribute “ServerName” to ports-02(8280) or ports-03(8380). These are pre-configured ports by JBoss.
For any new custom port other than the ones talked above, one will have to add new configurations to the file, specified in the path given for the attribute “StoreURL”.

For more information please refer the following doc,
http://docs.jboss.org/jbossas/jboss4guide/r3/html/ch10.html

Jboss 5.x.x

JBoss 5 also comes with a set of 4 predefined ports, 8080, 8180, 8280 and 8380.
By default, any server instance is bind to run with 8080(for http) and 8443(for https).

But in order to run with the other ports mentioned above, one can start the server with the following command,

run -c server_instance_name -Djboss.service.binding.set=ports-01

The above command will start the JBoss server instance with port 8180.
The related port values will as well get incremented with 100.

If one wants to configure a custom port other than the ones mentioned, then one’ll have to edit the pre-configured bindings(or add new) in following file,
\\LiveCycle_Installation\jboss\server\Server_Instance\conf\bindingservice.beans\META-INF\bindings-jboss-beans.xml

For more information please refer the following doc,
https://community.jboss.org/wiki/ConfigurePorts

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BeanShell scripting via LiveCycle Workbench

Adobe Livecycle Workbench provides a great tool for executing BeanShell scripts.

BeanShells sripts allow executing a piece of code on the fly. The best part of BeanShell scripting is that it doesn’t have unnecessary syntactic sugar which complicates and increases the learning curve. Rather one can simply use his/her java skills and write down the code and run it on the fly on a LiveCycle running server.

This mostly comes handy when one wants to execute a code quickly on the server but wants to avoid creating a project in an IDE and going through all the hassles of collecting the dependent jars in class-path and thereafter instantiating ServiceClientFactory and providing server details to connect.

Since the script gets executes within VM, hence it doesn’t require the pre-requisites such as providing the dependent jars or server detail configurations.

The following example demonstrates a simple “Hello World” code written in BeanShell script and executed on the LiveCycle server.

I’ve written a cookbook recipe for invoking various User Manager APIs through BeanShell scripting which one can find at,

http://cookbooks.adobe.com/post_Accessing_User_Manager_API_through_BeanShell_Scrip-17405.html

1. Connect the Workbench to a running LiveCycle server.

2. Create a new Application. Specify the name of the Application and click on Finish button.

3. Create a New Process under the Application.

4. Mention the Process name and click on Finish button.

5. A Process SwimLane will be opened on the right side. Drag the Activity Picker and attach it to the “Default Start Point”.

6. Once done, a “Define Activity” pod comes up. Enter the Activity name and search for “execute script” in the Find box.

Else, the Execute Script activity can also be found by navigating to “Foundation->Execute Script 1.0″ under Service tab.

Click OK.

7. Once done there will be a new window opened on the left side with the name “executeService Operation”. Click on the button in the Input box.

This will open up a Text Area where the code to be executed can be written.

8. Enter the code with proper imports and click on OK button. Then click the Save button on the top left corner or press CTRL+S.

9. Goto the Applications tab in the left top corner. Right click on the relevant process and click on “Invoke”.

Click OK on the screen where it asks “Check in all files”. Click OK on the next screen where it notifies of “No Input Variables”.

10. Look into the server logs of the application server on which LiveCycle server is running. The output will be printed in the INFO level logs.

The above was a simple example to show the working of BeanShell script in LiveCycle through Workbench.

But in Enterprise world the script would be interacting with inputs from different processes and returning processed results to further joining processes.This can be achieved through patExecContext object which is explicitly available to the script.

An example can be found at,

http://help.adobe.com/en_us/livecycle/9.0/workbenchHelp/help.htm?content=000581.html

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