Avatar Server for Jira - exception with Jira v6.4.14

[SB]

We are running Jira v6.4.14 (yes, I know :-) and have problems running the avatar server plugin (tried several versions, including the lastest 1.3.3) 

    https://marketplace.atlassian.com/apps/1213281/avatar-server-for-jira

It worked in older jira 6.X versions but with 6.4.14 we got the exception:

    java.lang.NoClassDefFoundError: org/apache/batik/transcoder/TranscoderException

when trying to access the avatar with via the rest URL.

Any idea how to fix this or what has changed ? 

Thanks.

2018-08-01 12:39:39,839 http-bio-8080-exec-1 ERROR anonymous 759x301x4 1ra7hvv 10.89.4.120 /rest/avatar/1.0/server/b88e2cf47790bbb6a8081fe65fa0d5e2 [atlassian.plugin.servlet.DefaultServletModuleManager] Unable to create new reference LazyLoadedFilterReference{descriptor=it.openmindonline.jiraextensions.jira-avatar-server:avatar-resource-filter (Avatar Server Module), filterConfig=com.atlassian.plugin.servlet.filter.PluginFilterConfig@30089748}
com.atlassian.util.concurrent.LazyReference$InitializationException: java.lang.NoClassDefFoundError: org/apache/batik/transcoder/TranscoderException
 at com.atlassian.util.concurrent.LazyReference.getInterruptibly(LazyReference.java:149)
 at com.atlassian.util.concurrent.LazyReference.get(LazyReference.java:112)
 at com.atlassian.plugin.servlet.DefaultServletModuleManager.getInstance(DefaultServletModuleManager.java:371)
 at com.atlassian.plugin.servlet.DefaultServletModuleManager.getFilter(DefaultServletModuleManager.java:362)
 at com.atlassian.plugin.servlet.DefaultServletModuleManager.getFilters(DefaultServletModuleManager.java:245)
 at com.atlassian.plugins.rest.module.servlet.DefaultRestServletModuleManager.getFilters(DefaultRestServletModuleManager.java:117)  <+14> (ServletFilterModuleContainerFilter.java:75) (ServletFilterModuleContainerFilter.java:63) (DelegatingPluginFilter.java:78) (IteratingFilterChain.java:42) (DelegatingPluginFilter.java:70) (RestServletUtilsUpdaterFilter.java:26) (RestServletUtilsUpdaterFilter.java:40) (DelegatingPluginFilter.java:78) (IteratingFilterChain.java:42) (DelegatingPluginFilter.java:70) (ContextFilter.java:25) (DelegatingPluginFilter.java:78) (IteratingFilterChain.java:42) (DelegatingPluginFilter.java:70)
 at com.atlassian.mywork.client.filter.ServingRequestsFilter.doFilter(ServingRequestsFilter.java:37)  <+3> (DelegatingPluginFilter.java:78) (IteratingFilterChain.java:42) (DelegatingPluginFilter.java:70)
 at com.atlassian.plugins.cors.CorsFilter.doFilter(CorsFilter.java:65)  <+3> (DelegatingPluginFilter.java:78) (IteratingFilterChain.java:42) (DelegatingPluginFilter.java:70)
 at com.atlassian.prettyurls.filter.PrettyUrlsSiteMeshFixupFilter.doFilter(PrettyUrlsSiteMeshFixupFilter.java:36)  <+3> (DelegatingPluginFilter.java:78) (IteratingFilterChain.java:42) (DelegatingPluginFilter.java:70)
 at com.atlassian.prettyurls.filter.PrettyUrlsDispatcherFilter.doFilter(PrettyUrlsDispatcherFilter.java:60)  <+3> (DelegatingPluginFilter.java:78) (IteratingFilterChain.java:42) (DelegatingPluginFilter.java:70)
 at com.atlassian.prettyurls.filter.PrettyUrlsSiteMeshFilter.doFilter(PrettyUrlsSiteMeshFilter.java:92)  <+3> (DelegatingPluginFilter.java:78) (IteratingFilterChain.java:42) (DelegatingPluginFilter.java:70)
 at com.atlassian.prettyurls.filter.PrettyUrlsMatcherFilter.doFilter(PrettyUrlsMatcherFilter.java:56)  <+3> (DelegatingPluginFilter.java:78) (IteratingFilterChain.java:42) (DelegatingPluginFilter.java:70)
 at com.atlassian.labs.botkiller.BotKillerFilter.doFilter(BotKillerFilter.java:36)  <+21> (DelegatingPluginFilter.java:78) (IteratingFilterChain.java:42) (ServletFilterModuleContainerFilter.java:77) (ServletFilterModuleContainerFilter.java:63) (ApplicationFilterChain.java:241) (ApplicationFilterChain.java:208) (AccessLogFilter.java:105) (AccessLogFilter.java:89) (ApplicationFilterChain.java:241) (ApplicationFilterChain.java:208) (XsrfTokenAdditionRequestFilter.java:54) (ApplicationFilterChain.java:241) (ApplicationFilterChain.java:208) (PageBuilderFilter.java:90) (ApplicationFilterChain.java:241) (ApplicationFilterChain.java:208) (CommittedResponseHtmlErrorRecoveryFilter.java:63) (ApplicationFilterChain.java:241) (ApplicationFilterChain.java:208) (IteratingFilterChain.java:46) (DelegatingPluginFilter.java:70)
 at com.atlassian.prettyurls.filter.PrettyUrlsCombinedMatchDispatcherFilter.doFilter(PrettyUrlsCombinedMatchDispatcherFilter.java:61)  <+22> (DelegatingPluginFilter.java:78) (IteratingFilterChain.java:42) (ServletFilterModuleContainerFilter.java:77) (ServletFilterModuleContainerFilter.java:63) (ApplicationFilterChain.java:241) (ApplicationFilterChain.java:208) (SecurityFilter.java:239) (ApplicationFilterChain.java:241) (ApplicationFilterChain.java:208) (TrustedApplicationsFilter.java:100) (ApplicationFilterChain.java:241) (ApplicationFilterChain.java:208) (BaseLoginFilter.java:172) (JiraLoginFilter.java:70) (ApplicationFilterChain.java:241) (ApplicationFilterChain.java:208) (IteratingFilterChain.java:46) (DelegatingPluginFilter.java:70) (OAuthFilter.java:79) (DelegatingPluginFilter.java:78) (IteratingFilterChain.java:42) (DelegatingPluginFilter.java:70)
 at com.atlassian.plugins.rest.module.servlet.RestSeraphFilter.doFilter(RestSeraphFilter.java:40)  <+3> (DelegatingPluginFilter.java:78) (IteratingFilterChain.java:42) (DelegatingPluginFilter.java:70)
 at com.atlassian.prettyurls.filter.PrettyUrlsCombinedMatchDispatcherFilter.doFilter(PrettyUrlsCombinedMatchDispatcherFilter.java:61)  <+9> (DelegatingPluginFilter.java:78) (IteratingFilterChain.java:42) (ServletFilterModuleContainerFilter.java:77) (ServletFilterModuleContainerFilter.java:63) (ApplicationFilterChain.java:241) (ApplicationFilterChain.java:208) (AbstractJohnsonFilter.java:71) (ApplicationFilterChain.java:241) (ApplicationFilterChain.java:208)
 at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:176)
 at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
 at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)  <+5> (UrlRewriteFilter.java:394) (ApplicationFilterChain.java:241) (ApplicationFilterChain.java:208) (IteratingFilterChain.java:46) (DelegatingPluginFilter.java:70)
 at com.atlassian.analytics.client.filter.JiraAnalyticsFilter.doFilter(JiraAnalyticsFilter.java:40)
 at com.atlassian.analytics.client.filter.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)  <+3> (DelegatingPluginFilter.java:78) (IteratingFilterChain.java:42) (DelegatingPluginFilter.java:70)
 at com.atlassian.prettyurls.filter.PrettyUrlsCombinedMatchDispatcherFilter.doFilter(PrettyUrlsCombinedMatchDispatcherFilter.java:61)  <+45> (DelegatingPluginFilter.java:78) (IteratingFilterChain.java:42) (ServletFilterModuleContainerFilter.java:77) (ServletFilterModuleContainerFilter.java:63) (ApplicationFilterChain.java:241) (ApplicationFilterChain.java:208) (ChainedFilterStepRunner.java:87) (ApplicationFilterChain.java:241) (ApplicationFilterChain.java:208) (AbstractCachingFilter.java:33) (AbstractHttpFilter.java:31) (ApplicationFilterChain.java:241) (ApplicationFilterChain.java:208) (AbstractEncodingFilter.java:41) (AbstractHttpFilter.java:31) (PathMatchingEncodingFilter.java:45) (AbstractHttpFilter.java:31) (ApplicationFilterChain.java:241) (ApplicationFilterChain.java:208) (JiraStartupChecklistFilter.java:79) (ApplicationFilterChain.java:241) (ApplicationFilterChain.java:208) (MultipartBoundaryCheckFilter.java:41) (ApplicationFilterChain.java:241) (ApplicationFilterChain.java:208) (ChainedFilterStepRunner.java:87) (JiraFirstFilter.java:61) (ApplicationFilterChain.java:241) (ApplicationFilterChain.java:208) (GzipFilter.java:115) (GzipFilter.java:92) (JiraGzipFilter.java:56) (ApplicationFilterChain.java:241) (ApplicationFilterChain.java:208) (StandardWrapperValve.java:220) (StandardContextValve.java:122) (AuthenticatorBase.java:501) (StandardHostValve.java:171) (ErrorReportValve.java:103) (StandardEngineValve.java:116) (AccessLogValve.java:950) (CoyoteAdapter.java:408) (AbstractHttp11Processor.java:1070) (AbstractProtocol.java:611) (JIoEndpoint.java:314)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
 at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
 at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NoClassDefFoundError: org/apache/batik/transcoder/TranscoderException
 at java.lang.Class.getDeclaredConstructors0(Native Method)
 at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671)
 at java.lang.Class.getConstructors(Class.java:1651)
 at com.sun.jersey.server.impl.modelapi.annotation.IntrospectionModeller.createResource(IntrospectionModeller.java:111)
 at com.sun.jersey.server.impl.application.WebApplicationImpl.getAbstractResource(WebApplicationImpl.java:745)  <+4> (WebApplicationImpl.java:1295) (WebApplicationImpl.java:169) (WebApplicationImpl.java:775) (WebApplicationImpl.java:771)
 at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193)  <+1> (WebApplicationImpl.java:771)
 at com.atlassian.plugins.rest.module.RestDelegatingServletFilter$JerseyOsgiServletContainer.initiate(RestDelegatingServletFilter.java:184)  <+5> (ServletContainer.java:318) (WebComponent.java:609) (WebComponent.java:210) (ServletContainer.java:373) (ServletContainer.java:710)
 at com.atlassian.plugins.rest.module.RestDelegatingServletFilter.initServletContainer(RestDelegatingServletFilter.java:99)
 at com.atlassian.plugins.rest.module.RestDelegatingServletFilter.init(RestDelegatingServletFilter.java:64)  <+1> (DelegatingPluginFilter.java:43)
 at com.atlassian.plugin.servlet.DefaultServletModuleManager$LazyLoadedFilterReference.create(DefaultServletModuleManager.java:422)
 at com.atlassian.plugin.servlet.DefaultServletModuleManager$LazyLoadedFilterReference.create(DefaultServletModuleManager.java:406)
 at com.atlassian.util.concurrent.LazyReference$Sync.run(LazyReference.java:325)
 at com.atlassian.util.concurrent.LazyReference.getInterruptibly(LazyReference.java:143)
 ... 165 more