[ https://issues.jboss.org/browse/ARQ-1944?page=com.atlassian.jira.plugin.s... ] Marc Richards edited comment on ARQ-1944 at 1/30/16 6:22 PM: ------------------------------------------------------------- Just wanted to add a few clarifications from my own testing as well 1) Yea, the latest releases of arquillian-tomcat-embedded have a bug when used with tomcat versions lower than 7.0.52, which makes the issue even more tricky: https://issues.jboss.org/browse/ARQ-1965 2) My errors are not related to hamcrest at all, the loader constraint violations are thrown for my own classes e.g. {code:java} java.lang.LinkageError: loader constraint violation: when resolving method "myorg.model.PollingEvent.<init>(Lorg/joda/time/DateTime;Lmyorg/rest/model/OrderStatus;Lorg/joda/time/DateTime;)V" the class loader (instance of org/apache/catalina/loader/WebappClassLoader) of the current class, myorg/db/PollingEventManager, and the class loader (instance of sun/misc/Launcher$AppClassLoader) for the method's defining class, myorg/model/PollingEvent, have different Class objects for the type myorg/rest/model/OrderStatus used in the signature {code} or {code:java} java.lang.LinkageError: loader constraint violation: loader (instance of sun/misc/Launcher$AppClassLoader) previously initiated loading for a different type with name "myorg/rest/model/Product" {code} 3) Using @RunAsClient does workaround the issue for me as well except for some tests, however some tests make use of features of the app server and cannot be run as client was (Author: talawahdotnet): Just wanted to add a few clarifications from my own testing as well 1) Yea, the latest releases of arquillian-tomcat-embedded have a bug when used with tomcat versions lower than 7.0.52, which makes the issue even more tricky: https://issues.jboss.org/browse/ARQ-1965 2) My errors are not related to hamcrest at all, the loader constraint violations are thrown for my own classes e.g. {code:java} java.lang.LinkageError: loader constraint violation: when resolving method "myorg.model.PollingEvent.<init>(Lorg/joda/time/DateTime;Lmyorg/rest/model/OrderStatus;Lorg/joda/time/DateTime;)V" the class loader (instance of org/apache/catalina/loader/WebappClassLoader) of the current class, myorg/db/PollingEventManager, and the class loader (instance of sun/misc/Launcher$AppClassLoader) for the method's defining class, myorg/model/PollingEvent, have different Class objects for the type myorg/rest/model/OrderStatus used in the signature {code} or {code:java} java.lang.LinkageError: loader constraint violation: loader (instance of sun/misc/Launcher$AppClassLoader) previously initiated loading for a different type with name "myorg/rest/model/Product" {code} 3) Using @RunAsClient does workaround the issue for me as well except for some tests, however some tests make use of features of the app server and cannot be run as client 3) -- This message was sent by Atlassian JIRA (v6.4.11#64026)