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  1. ,

    AbstractMethodError is thrown when an application tries to call an abstract method. URI is an abstract method in UriBuilder, so you need an implementation of this. How to fix it : https://goo.gl/S6CPfP

  2. ,
    via Stack Overflow by M. Deinum

    It has all to do with the javax.validation api and hibernate. A probable compatibility issue. Either downgrade the included javax.validation version or upgrade your hibernate validator to 5.0.x (or the latest).

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java.lang.AbstractMethodError: com.liferay.util.bridges.wai.WAIFriendlyURLMapper.setMapping(Ljava/lang/String;)V	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at com.liferay.portal.kernel.bean.ClassLoaderBeanHandler.invoke(ClassLoaderBeanHandler.java:54)	at undefined.$Proxy316.setMapping(Unknown Source)	at com.liferay.portlet.PortletBagFactory.newFriendlyURLMapper(PortletBagFactory.java:470)	at com.liferay.portlet.PortletBagFactory.create(PortletBagFactory.java:131)	at com.liferay.portal.deploy.hot.PortletHotDeployListener.initPortlet(PortletHotDeployListener.java:458)	at com.liferay.portal.deploy.hot.PortletHotDeployListener.doInvokeDeploy(PortletHotDeployListener.java:255)	at com.liferay.portal.deploy.hot.PortletHotDeployListener.invokeDeploy(PortletHotDeployListener.java:103)	at com.liferay.portal.kernel.deploy.hot.HotDeployUtil._doFireDeployEvent(HotDeployUtil.java:106)	at com.liferay.portal.kernel.deploy.hot.HotDeployUtil._fireDeployEvent(HotDeployUtil.java:151)	at com.liferay.portal.kernel.deploy.hot.HotDeployUtil.fireDeployEvent(HotDeployUtil.java:33)	at com.liferay.portal.kernel.servlet.PortletContextListener.portalInit(PortletContextListener.java:102)	at com.liferay.portal.kernel.util.PortalInitableUtil.init(PortalInitableUtil.java:37)	at com.liferay.portal.kernel.servlet.PortletContextListener.contextInitialized(PortletContextListener.java:98)	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3972)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4467)	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:546)	at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:905)	at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:740)	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:500)	at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1345)	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:303)	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)	at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1337)	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601)	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)	at java.lang.Thread.run(Unknown Source)