this one:

Attribute memberAttribute = result.getAttributes().get("member");

should be:

Attribute memberAttribute = result.getAttributes().get(ldapConfiguration.getGroupMemberAttribute());

Stacktrace:
11:42:52,091 SEVERE
[org.camunda.bpm.engine.impl.interceptor.CommandContext]
(http-/0.0.0.0:8080-4) Error while closing command context:
java.lang.NullPointerException
at
org.camunda.bpm.identity.impl.ldap.LdapIdentityProviderSession.findUsersByGroupId(LdapIdentityProviderSession.java:173)
at
org.camunda.bpm.identity.impl.ldap.LdapIdentityProviderSession.findUserByQueryCriteria(LdapIdentityProviderSession.java:149)
at
org.camunda.bpm.identity.impl.ldap.LdapUserQueryImpl.executeList(LdapUserQueryImpl.java:53)
at
org.camunda.bpm.engine.impl.AbstractQuery.execute(AbstractQuery.java:137) [camunda-engine-7.0.1-ee.jar:]
at
org.camunda.bpm.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:24)
[camunda-engine-7.0.1-ee.jar:]
at
org.camunda.bpm.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:42)
[camunda-engine-7.0.1-ee.jar:]
at
org.camunda.bpm.engine.impl.interceptor.JtaTransactionInterceptor.execute(JtaTransactionInterceptor.java:59)
[camunda-engine-7.0.1-ee.jar:]
at
org.camunda.bpm.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:32)
[camunda-engine-7.0.1-ee.jar:]
at
org.camunda.bpm.engine.impl.AbstractQuery.list(AbstractQuery.java:111)
[camunda-engine-7.0.1-ee.jar:]
at
org.camunda.bpm.engine.rest.impl.IdentityRestServiceImpl.getGroupInfo(IdentityRestServiceImpl.java:57)
[camunda-engine-rest-7.0.1-ee-classes.jar:]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[rt.jar:1.7.0_25]
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
[rt.jar:1.7.0_25]
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[rt.jar:1.7.0_25]
at java.lang.reflect.Method.invoke(Method.java:606) [rt.jar:1.7.0_25]
at
org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:167)
[resteasy-jaxrs-2.3.3.Final.jar:]
at
org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:257)
[resteasy-jaxrs-2.3.3.Final.jar:]
at
org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:222)
[resteasy-jaxrs-2.3.3.Final.jar:]
at
org.jboss.resteasy.core.ResourceLocator.invokeOnTargetObject(ResourceLocator.java:152)
[resteasy-jaxrs-2.3.3.Final.jar:]
at
org.jboss.resteasy.core.ResourceLocator.invoke(ResourceLocator.java:91)
[resteasy-jaxrs-2.3.3.Final.jar:]
at
org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:525)
[resteasy-jaxrs-2.3.3.Final.jar:]
at
org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:502)
[resteasy-jaxrs-2.3.3.Final.jar:]
at
org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:119)
[resteasy-jaxrs-2.3.3.Final.jar:]
at
org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208)
[resteasy-jaxrs-2.3.3.Final.jar:]
at
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55)
[resteasy-jaxrs-2.3.3.Final.jar:]
at
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50)
[resteasy-jaxrs-2.3.3.Final.jar:]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
[jboss-servlet-api_3.0_spec-1.0.1.Final.jar:1.0.1.Final]
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329)
[jbossweb-7.0.17.Final.jar:]
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
[jbossweb-7.0.17.Final.jar:]
at
org.camunda.bpm.engine.rest.filter.CacheControlFilter.doFilter(CacheControlFilter.java:47)
[camunda-engine-rest-7.0.1-ee-classes.jar:]
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)
[jbossweb-7.0.17.Final.jar:]
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
[jbossweb-7.0.17.Final.jar:]
at
org.camunda.bpm.webapp.impl.security.filter.SecurityFilter.doFilterSecure(SecurityFilter.java:67)
[classes:]
at
org.camunda.bpm.webapp.impl.security.filter.SecurityFilter.doFilter(SecurityFilter.java:51)
[classes:]
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)
[jbossweb-7.0.17.Final.jar:]
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
[jbossweb-7.0.17.Final.jar:]
at
org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter$1.execute(AuthenticationFilter.java:59)
[classes:]
at
org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter$1.execute(AuthenticationFilter.java:56)
[classes:]
at
org.camunda.bpm.webapp.impl.security.SecurityActions.runWithAuthentications(SecurityActions.java:38)
[classes:]
at
org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter.doFilter(AuthenticationFilter.java:56)
[classes:]
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)
[jbossweb-7.0.17.Final.jar:]
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
[jbossweb-7.0.17.Final.jar:]
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275)
[jbossweb-7.0.17.Final.jar:]
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
[jbossweb-7.0.17.Final.jar:]
at
org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:165)
[jboss-as-web-7.1.3.Final.jar:7.1.3.Final]
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155)
[jbossweb-7.0.17.Final.jar:]
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
[jbossweb-7.0.17.Final.jar:]
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
[jbossweb-7.0.17.Final.jar:]
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:372)
[jbossweb-7.0.17.Final.jar:]
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877)
[jbossweb-7.0.17.Final.jar:]
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:679)
[jbossweb-7.0.17.Final.jar:]
at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:931)
[jbossweb-7.0.17.Final.jar:]
at java.lang.Thread.run(Thread.java:724) [rt.jar:1.7.0_25]

11:42:52,108 WARNING [ExceptionHandler] (http-/0.0.0.0:8080-4)
java.lang.NullPointerException
at
org.camunda.bpm.identity.impl.ldap.LdapIdentityProviderSession.findUsersByGroupId(LdapIdentityProviderSession.java:173)
at
org.camunda.bpm.identity.impl.ldap.LdapIdentityProviderSession.findUserByQueryCriteria(LdapIdentityProviderSession.java:149)
at
org.camunda.bpm.identity.impl.ldap.LdapUserQueryImpl.executeList(LdapUserQueryImpl.java:53)
at
org.camunda.bpm.engine.impl.AbstractQuery.execute(AbstractQuery.java:137)
at
org.camunda.bpm.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:24)
at
org.camunda.bpm.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:42)
at
org.camunda.bpm.engine.impl.interceptor.JtaTransactionInterceptor.execute(JtaTransactionInterceptor.java:59)
at
org.camunda.bpm.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:32)
at org.camunda.bpm.engine.impl.AbstractQuery.list(AbstractQuery.java:111)
at
org.camunda.bpm.engine.rest.impl.IdentityRestServiceImpl.getGroupInfo(IdentityRestServiceImpl.java:57)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at
org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:167)
at
org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:257)
at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:222)
at
org.jboss.resteasy.core.ResourceLocator.invokeOnTargetObject(ResourceLocator.java:152)
at org.jboss.resteasy.core.ResourceLocator.invoke(ResourceLocator.java:91)
at
org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:525)
at
org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:502)
at
org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:119)
at
org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208)
at
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55)
at
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
at
org.camunda.bpm.engine.rest.filter.CacheControlFilter.doFilter(CacheControlFilter.java:47)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
at
org.camunda.bpm.webapp.impl.security.filter.SecurityFilter.doFilterSecure(SecurityFilter.java:67)
at
org.camunda.bpm.webapp.impl.security.filter.SecurityFilter.doFilter(SecurityFilter.java:51)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
at
org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter$1.execute(AuthenticationFilter.java:59)
at
org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter$1.execute(AuthenticationFilter.java:56)
at
org.camunda.bpm.webapp.impl.security.SecurityActions.runWithAuthentications(SecurityActions.java:38)
at
org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter.doFilter(AuthenticationFilter.java:56)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
at
org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:165)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:372)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:679)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:931)
at java.lang.Thread.run(Thread.java:724)