Set up Java dxa-example-webapp fails with Nullpointer for missing binary /system/assets

Question

Help requested to set up DXA Sample Java webApp on Tomcat :

Trying to install DXA 1.2 for Java on Tomcat 8+ as-is distribution from download site.

No changes except config xmls.

Here is cd_dynamic_conf.xml, rest of the file is as provided.

<Host Domain="www.javadxa.com" Port="8080" Protocol="http" path="/com.td.www.dxa"/>

Exception stacktrace is

com.sdl.webapp.common.api.localization.LocalizationResolverException: Exception while creating localization: [3] /dxa-example-webapp at com.sdl.webapp.tridion.TridionLocalizationResolver.createLocalization(TridionLocalizationResolver.java:90) ~[dxa-tridion-provider-1.2-SNAPSHOT.jar:1.2-SNAPSHOT] at com.sdl.webapp.tridion.TridionLocalizationResolver.getLocalization(TridionLocalizationResolver.java:57) ~[dxa-tridion-provider-1.2-SNAPSHOT.jar:1.2-SNAPSHOT] at com.sdl.webapp.common.impl.interceptor.LocalizationResolverInterceptor.preHandle(LocalizationResolverInterceptor.java:66) ~[dxa-common-impl-1.2-SNAPSHOT.jar:1.2-SNAPSHOT] at org.springframework.web.servlet.HandlerExecutionChain.applyPreHandle(HandlerExecutionChain.java:130) ~[spring-webmvc-3.2.8.RELEASE.jar:3.2.8.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:919) ~[spring-webmvc-3.2.8.RELEASE.jar:3.2.8.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856) ~[spring-webmvc-3.2.8.RELEASE.jar:3.2.8.RELEASE] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:953) [spring-webmvc-3.2.8.RELEASE.jar:3.2.8.RELEASE] at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:844) [spring-webmvc-3.2.8.RELEASE.jar:3.2.8.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:622) [servlet-api.jar:na] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:829) [spring-webmvc-3.2.8.RELEASE.jar:3.2.8.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) [servlet-api.jar:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) [catalina.jar:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.30] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-websocket.jar:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.30] at com.tridion.ambientdata.web.AmbientDataServletFilter.doFilter(AmbientDataServletFilter.java:302) [cd_ambient-7.1.0.jar:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.30] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) [spring-web-3.2.8.RELEASE.jar:3.2.8.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-3.2.8.RELEASE.jar:3.2.8.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.30] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.30] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212) [catalina.jar:8.0.30] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) [catalina.jar:8.0.30] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) [catalina.jar:8.0.30] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141) [catalina.jar:8.0.30] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [catalina.jar:8.0.30] at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) [catalina.jar:8.0.30] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) [catalina.jar:8.0.30] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:521) [catalina.jar:8.0.30] at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1096) [tomcat-coyote.jar:8.0.30] at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:674) [tomcat-coyote.jar:8.0.30] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500) [tomcat-coyote.jar:8.0.30] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456) [tomcat-coyote.jar:8.0.30] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_79] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_79] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:8.0.30] at java.lang.Thread.run(Thread.java:745) [na:1.7.0_79] Caused by: com.sdl.webapp.common.api.localization.LocalizationFactoryException: Exception while reading configuration of localization: [3] /dxa-example-webapp at com.sdl.webapp.common.impl.localization.LocalizationFactoryImpl.parseJsonFileTree(LocalizationFactoryImpl.java:195) ~[dxa-common-impl-1.2-SNAPSHOT.jar:1.2-SNAPSHOT] at com.sdl.webapp.common.impl.localization.LocalizationFactoryImpl.loadMainConfiguration(LocalizationFactoryImpl.java:110) ~[dxa-common-impl-1.2-SNAPSHOT.jar:1.2-SNAPSHOT] at com.sdl.webapp.common.impl.localization.LocalizationFactoryImpl.createLocalization(LocalizationFactoryImpl.java:86) ~[dxa-common-impl-1.2-SNAPSHOT.jar:1.2-SNAPSHOT] at com.sdl.webapp.tridion.TridionLocalizationResolver.createLocalization(TridionLocalizationResolver.java:88) ~[dxa-tridion-provider-1.2-SNAPSHOT.jar:1.2-SNAPSHOT] ... 38 common frames omitted Caused by: com.sdl.webapp.common.api.content.StaticContentNotFoundException: No binary variant found for: [3] /dxa-example-webapp/system/config/_all.json at com.sdl.webapp.tridion.DefaultProvider.getStaticContentFile(DefaultProvider.java:301) ~[dxa-tridion-provider-1.2-SNAPSHOT.jar:1.2-SNAPSHOT] at com.sdl.webapp.tridion.DefaultProvider.getStaticContent(DefaultProvider.java:260) ~[dxa-tridion-provider-1.2-SNAPSHOT.jar:1.2-SNAPSHOT] at com.sdl.webapp.common.impl.localization.LocalizationFactoryImpl.parseJsonFileTree(LocalizationFactoryImpl.java:190) ~[dxa-common-impl-1.2-SNAPSHOT.jar:1.2-SNAPSHOT]

The Localization exceptions suggest that your cd_dynamic_conf is not properly configured. Did you follow the steps listed here? docs.sdl.com/LiveContent/content/en-US/SDL%20DXA-v2/… — Nuno Linhares♦, Dec 23 '15 at 22:04
can you edit your question and show what is listed in your cd_dynamic_conf.xml and confirm that the URL(s) and Publication ID(s) in there are indeed correct? — Bart Koopman, Dec 24 '15 at 8:05
@NunoLinhares - Yep have followed all steps as stated in live content. — Milind, Dec 24 '15 at 23:13
@BartKoopman - Thanks for suggestion! Have provided host entry from config file. — Milind, Dec 24 '15 at 23:14
This might sound silly, but are you using that URL and path to access the site? Http://www.javadxa.com:8080/com.td.www.dxa? — Nuno Linhares♦, Dec 24 '15 at 23:37

Bart Koopman · Accepted Answer · 2016-07-21 13:37:22Z

Thanks for all suggestions! Here is how I could make it work.

Added dxa-example-webapp as root application in Tomcat 8 by editing server.xml file host element as below

<Host name="localhost"  appBase="webapps" unpackWARs="true" autoDeploy="true">

  <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
       prefix="localhost_access_log" suffix=".txt"
       pattern="%h %l %u %t &quot;%r&quot; %s %b" />
  <Context path="/" docBase="dxa-example-webapp">
    <WatchedResource>WEB-INF/web.xml</WatchedResource>
  </Context>
  <Context path="/ROOT" docBase="ROOT">
    <WatchedResource>WEB-INF/web.xml</WatchedResource>
  </Context>
  <Context path="/manager" docBase="manager" privileged="true">
    <WatchedResource>WEB-INF/web.xml</WatchedResource>
  </Context>
  <Context path="/host-manager" docBase="host-manager" privileged="true">
    <WatchedResource>WEB-INF/web.xml</WatchedResource>
  </Context>
</Host>

Modify etc/host file on windows to map local host name to a desired domain of DXA application.
```
127.0.0.1 www.javadxa.com
```

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Set up Java dxa-example-webapp fails with Nullpointer for missing binary /system/assets

Help requested to set up DXA Sample Java webApp on Tomcat :

Exception stacktrace is

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