Question
Standard Chartered Bank
IN
Last activity: 7 Aug 2023 10:34 EDT
java.lang.LinkageError: loader constraint violation Exception post upgrade to Pega 8.5.1
Hi, After upgrading from Pega 7.3.1 to Pega 8.5.1 we are seeing the below exception while executing an operation involving an external jar file. We have imported all external jars using Pega import . We tried removing/disabling httpclient and any other external jar if present else where in the server to avoid the conflicts but the issue remain. Any help appreciated!!
java.lang.LinkageError: loader constraint violation: loader (instance of com/pega/pegarules/bootstrap/loader/PRAppLoader) previously initiated loading for a different type with name "org/apache/commons/httpclient/HttpClient"
at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_252]
at java.lang.ClassLoader.defineClass(ClassLoader.java:756) ~[?:1.8.0_252]
at com.pega.pegarules.bootstrap.loader.PRAppLoader.findClassInternal(PRAppLoader.java:830) ~[prbasejava6.jar:?]
at com.pega.pegarules.bootstrap.loader.PRAppLoader.findClass(PRAppLoader.java:373) ~[prbasejava6.jar:?]
at com.pega.pegarules.bootstrap.loader.PRAppLoader.loadClassInternal(PRAppLoader.java:700) ~[prbasejava6.jar:?]
Hi, After upgrading from Pega 7.3.1 to Pega 8.5.1 we are seeing the below exception while executing an operation involving an external jar file. We have imported all external jars using Pega import . We tried removing/disabling httpclient and any other external jar if present else where in the server to avoid the conflicts but the issue remain. Any help appreciated!!
java.lang.LinkageError: loader constraint violation: loader (instance of com/pega/pegarules/bootstrap/loader/PRAppLoader) previously initiated loading for a different type with name "org/apache/commons/httpclient/HttpClient"
at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_252]
at java.lang.ClassLoader.defineClass(ClassLoader.java:756) ~[?:1.8.0_252]
at com.pega.pegarules.bootstrap.loader.PRAppLoader.findClassInternal(PRAppLoader.java:830) ~[prbasejava6.jar:?]
at com.pega.pegarules.bootstrap.loader.PRAppLoader.findClass(PRAppLoader.java:373) ~[prbasejava6.jar:?]
at com.pega.pegarules.bootstrap.loader.PRAppLoader.loadClassInternal(PRAppLoader.java:700) ~[prbasejava6.jar:?]
at com.pega.pegarules.bootstrap.loader.PRAppLoader.loadClass(PRAppLoader.java:625) ~[prbasejava6.jar:?]
at com.pega.pegarules.bootstrap.loader.PRAppLoader.loadClass(PRAppLoader.java:550) ~[prbasejava6.jar:?]
at com.scb.util.CSHTTPClientPool.<init>(CSHTTPClientPool.java:15) ~[CSClient-8.0.jar:?]
at com.scb.util.Communicator.<init>(Communicator.java:70) ~[CSClient-8.0.jar:?]
at com.scb.cs.client.CS.getCommunicator(CS.java:282) ~[CSClient-8.0.jar:?]
at com.scb.cs.client.CS.requestTokenJSON(CS.java:355) ~[CSClient-8.0.jar:?]
at com.scb.cs.client.CS.requestToken(CS.java:311) ~[CSClient-8.0.jar:?]
Updated: 11 Oct 2021 15:56 EDT
Cognizant Technology Solutions Pvt Ltd
US
@VishalS4We also faced a similar issue where our on premise application was not able to send email with attachment after we upgraded from Pega platform version 7.4 to 8.5.4
We were getting below exception while for any outbound email with attachment.
java.lang.LinkageError: loader constraint violation: when resolving interface method "javax.mail.Part.setDataHandler(Ljavax/activation/DataHandler;)V" the class loader (instance of com/pega/pegarules/bootstrap/loader/PRAppLoader) of the current class, com/pega/platform/integrationcore/client/email/internal/javamail/JavaMailPart, and the class loader (instance of org/jboss/modules/ModuleClassLoader) for the method's defining class, javax/mail/Part, have different Class objects for the type javax/activation/DataHandler used in the signature
We had to make a change in EAR file "jboss-deployment-structure.xml" to default Java Mail API to resolve this issue. I have attached the file for reference.
Note : There might be different setting/changes for application servers other than JBOSS.