If you try to deploy an application with Java5 you will get the following StackTrace:

java.lang.NoSuchMethodError: java/util/Properties.load(Ljava/io/Reader;)V

com.googlecode.s2hibernate.struts2.plugin.util.HibernateSessionFactory.createAndTestSessionFactory(HibernateSessionFactory.java:276)
com.googlecode.s2hibernate.struts2.plugin.util.HibernateSessionFactory.rebuildSessionFactory(HibernateSessionFactory.java:227)

com.googlecode.s2hibernate.struts2.plugin.util.HibernateSessionFactory.getNewSession(HibernateSessionFactory.java:155)
com.googlecode.s2hibernate.struts2.plugin.util.HibernateSessionFactory.getSession(HibernateSessionFactory.java:100)

com.googlecode.s2hibernate.struts2.plugin.interceptors.SessionTransactionInjectorInterceptor.getHibernateSessionFromFactory(SessionTransactionInjectorInterceptor.java:369)
com.googlecode.s2hibernate.struts2.plugin.interceptors.SessionTransactionInjectorInterceptor.injectHibernateCoreSessionByAnnotation(SessionTransactionInjectorInterceptor.java:444)

com.googlecode.s2hibernate.struts2.plugin.interceptors.SessionTransactionInjectorInterceptor.injectHibernateCoreSessionByAnnotation(SessionTransactionInjectorInterceptor.java:460)
com.googlecode.s2hibernate.struts2.plugin.interceptors.SessionTransactionInjectorInterceptor.intercept(SessionTransactionInjectorInterceptor.java:160)

com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
org.apache.struts2.json.JSONInterceptor.intercept(JSONInterceptor.java:179)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)

org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:488)
org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)

org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)

This bug affects all versions since 2.0 Beta.

Fixed in 2.1.4 GA