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Type: Bug Report
Resolution: Fixed
Priority: L3 - Default
Fix Version/s: 7.13.0
Affects Version/s: spring-boot 3.3.3
Component/s: spring-boot
Labels:
None
Environment:
* Spring Boot 2.1.7.RELEASE
* Camunda BPM 7.11.0
* Camunda BPM Spring Boot Starter 3.3.3
* Gradle 5.5.1

The Issue

Summary

Expectation: I want to embed Camunda into my Spring Boot application and access Camunda Cockpit with my browser.
Reality: My browser requests /api/cockpit/plugin/cockpitPlugins/static/app/plugin.css and api/cockpit/plugin/cockpitPlugins/static/app/plugin.js?bust=7.11.0, but does receive HTTP 404 response and the Spring Boot application shows the following Exceptions.

I discussed this issue in the forum (https://forum.camunda.org/t/404-error-after-cockpit-upgrade-to-7-9/12437/2?u=gregor). However, after three days of debugging I think I know why it doesn't work, but not yet how to fix it. Right now I assume there is some bug based on my investigations, hence this bug report. Note that in the forum thread I had Spring Security enabled. As you can see below in the build.gradle I have removed it to make sure it is not connected to some Spring Security interaction.

*Please* let me know if I can provide additional information.

Exception:

2019-08-13 11:58:09.103  WARN 24360 --- [nio-8090-exec-6] ExceptionHandler                         : org.camunda.bpm.engine.rest.exception.RestException: It was not able to load the following file 'app/plugin.css'.
	at org.camunda.bpm.webapp.plugin.resource.AbstractAppPluginRootResource.getAsset(AbstractAppPluginRootResource.java:146)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:567)
	at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:76)
	at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:148)
	at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:191)
	at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:200)
	at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:103)
	at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:493)
	at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:415)
	at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:104)
	at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:277)
	at org.glassfish.jersey.internal.Errors$1.call(Errors.java:272)
	at org.glassfish.jersey.internal.Errors$1.call(Errors.java:268)
	at org.glassfish.jersey.internal.Errors.process(Errors.java:316)
	at org.glassfish.jersey.internal.Errors.process(Errors.java:298)
	at org.glassfish.jersey.internal.Errors.process(Errors.java:268)
	at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:289)
	at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:256)
	at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:703)
	at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:416)
	at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:370)
	at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:389)
	at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:342)
	at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:229)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.camunda.bpm.webapp.impl.engine.ProcessEnginesFilter.applyFilter(ProcessEnginesFilter.java:130)
	at org.camunda.bpm.webapp.impl.filter.AbstractTemplateFilter.doFilter(AbstractTemplateFilter.java:58)
	at org.camunda.bpm.spring.boot.starter.webapp.filter.LazyDelegateFilter.doFilter(LazyDelegateFilter.java:60)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.camunda.bpm.webapp.impl.security.filter.headersec.HttpHeaderSecurityFilter.doFilter(HttpHeaderSecurityFilter.java:83)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.camunda.bpm.spring.boot.starter.webapp.filter.SpringBootCsrfPreventionFilter.doFilter(SpringBootCsrfPreventionFilter.java:129)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.camunda.bpm.webapp.impl.security.filter.SecurityFilter.doFilterSecure(SecurityFilter.java:71)
	at org.camunda.bpm.webapp.impl.security.filter.SecurityFilter.doFilter(SecurityFilter.java:55)
	at org.camunda.bpm.spring.boot.starter.webapp.filter.LazyDelegateFilter.doFilter(LazyDelegateFilter.java:60)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter$1.execute(AuthenticationFilter.java:62)
	at org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter$1.execute(AuthenticationFilter.java:60)
	at org.camunda.bpm.webapp.impl.security.SecurityActions.runWithAuthentications(SecurityActions.java:44)
	at org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter.doFilter(AuthenticationFilter.java:60)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.AbstractRequestLoggingFilter.doFilterInternal(AbstractRequestLoggingFilter.java:262)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:853)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.base/java.lang.Thread.run(Thread.java:835)

2019-08-13 11:58:09.103  WARN 24360 --- [nio-8090-exec-8] ExceptionHandler                         : org.camunda.bpm.engine.rest.exception.RestException: It was not able to load the following file 'app/plugin.js'.
	at org.camunda.bpm.webapp.plugin.resource.AbstractAppPluginRootResource.getAsset(AbstractAppPluginRootResource.java:146)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:567)
	at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:76)
	at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:148)
	at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:191)
	at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:200)
	at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:103)
	at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:493)
	at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:415)
	at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:104)
	at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:277)
	at org.glassfish.jersey.internal.Errors$1.call(Errors.java:272)
	at org.glassfish.jersey.internal.Errors$1.call(Errors.java:268)
	at org.glassfish.jersey.internal.Errors.process(Errors.java:316)
	at org.glassfish.jersey.internal.Errors.process(Errors.java:298)
	at org.glassfish.jersey.internal.Errors.process(Errors.java:268)
	at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:289)
	at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:256)
	at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:703)
	at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:416)
	at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:370)
	at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:389)
	at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:342)
	at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:229)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.camunda.bpm.webapp.impl.engine.ProcessEnginesFilter.applyFilter(ProcessEnginesFilter.java:130)
	at org.camunda.bpm.webapp.impl.filter.AbstractTemplateFilter.doFilter(AbstractTemplateFilter.java:58)
	at org.camunda.bpm.spring.boot.starter.webapp.filter.LazyDelegateFilter.doFilter(LazyDelegateFilter.java:60)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.camunda.bpm.webapp.impl.security.filter.headersec.HttpHeaderSecurityFilter.doFilter(HttpHeaderSecurityFilter.java:83)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.camunda.bpm.spring.boot.starter.webapp.filter.SpringBootCsrfPreventionFilter.doFilter(SpringBootCsrfPreventionFilter.java:129)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.camunda.bpm.webapp.impl.security.filter.SecurityFilter.doFilterSecure(SecurityFilter.java:71)
	at org.camunda.bpm.webapp.impl.security.filter.SecurityFilter.doFilter(SecurityFilter.java:55)
	at org.camunda.bpm.spring.boot.starter.webapp.filter.LazyDelegateFilter.doFilter(LazyDelegateFilter.java:60)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter$1.execute(AuthenticationFilter.java:62)
	at org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter$1.execute(AuthenticationFilter.java:60)
	at org.camunda.bpm.webapp.impl.security.SecurityActions.runWithAuthentications(SecurityActions.java:44)
	at org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter.doFilter(AuthenticationFilter.java:60)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.AbstractRequestLoggingFilter.doFilterInternal(AbstractRequestLoggingFilter.java:262)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:853)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.base/java.lang.Thread.run(Thread.java:835)

Environment

Spring Boot 2.1.7.RELEASE
Camunda BPM 7.11.0
Camunda BPM Spring Boot Starter 3.3.3
Gradle 5.5.1

Gradle Configuration

The following Gradle configuration is a subproject and the versions of each package are configured in the root build.gradle.

apply plugin: 'org.springframework.boot'
apply plugin: 'io.freefair.lombok'
apply plugin: 'net.ltgt.apt'
apply plugin: 'net.ltgt.apt-idea'

dependencies {

    implementation group: 'org.springframework.cloud', name:'spring-cloud-starter-openfeign'

    implementation group: 'org.springframework.boot', name: 'spring-boot-starter-web'
    implementation group: 'org.springframework.boot', name: 'spring-boot-starter-amqp'
    implementation group: 'org.springframework.boot', name: 'spring-boot-starter-data-mongodb'
    implementation group: 'org.springframework.boot', name: 'spring-boot-starter-mail'

    implementation group: 'org.springframework', name: 'spring-context-support'

    implementation group: 'io.springfox', name: 'springfox-swagger2'
    implementation group: 'io.springfox', name: 'springfox-swagger-ui'

    implementation group: 'org.modelmapper', name: 'modelmapper'
    implementation group: 'org.springframework.boot', name: 'spring-boot-starter-json'

    implementation group: 'org.quartz-scheduler', name: 'quartz'
    implementation group: 'org.quartz-scheduler', name: 'quartz-jobs'

    implementation group: 'org.camunda.bpm.springboot', name: 'camunda-bpm-spring-boot-starter'
    implementation group: 'org.camunda.bpm.springboot', name: 'camunda-bpm-spring-boot-starter-webapp'
    implementation group: 'org.camunda.bpm.springboot', name: 'camunda-bpm-spring-boot-starter-rest'
    implementation group: 'org.camunda.bpm.webapp', name: 'camunda-webapp-webjar'

    implementation group: 'com.sun.xml.bind', name: 'jaxb-impl'
    implementation group: 'com.h2database', name: 'h2'

    implementation group: 'org.mapstruct', name: 'mapstruct'
    annotationProcessor group: 'org.mapstruct', name: 'mapstruct-processor'

    testImplementation group: 'org.springframework.boot', name: 'spring-boot-starter-test'
    testImplementation group: 'org.springframework.amqp', name: 'spring-rabbit-junit'
    testImplementation group: 'org.springframework.amqp', name: 'spring-rabbit-test'

    testImplementation group: 'org.apache.httpcomponents', name: 'httpclient'

    testImplementation group: 'org.camunda.bpm.springboot', name: 'camunda-bpm-spring-boot-starter-test'

    testRuntimeOnly group: 'de.flapdoodle.embed', name: 'de.flapdoodle.embed.mongo'
}

Identified Reason

The issue manifests if we start the Spring Boot application with the bootRun Gradle task (introduced by Gradle Plugin org.springframework.boot) or run it with IntelliJ's "Services" tab where we can start the Spring Boot application, too. Note that IntelliJ is configured to use Gradle to start (File | Settings | Build, Execution, Deployment | Build Tools | Gradle):

"Build and run using" is set to "Gradle"
"Run tests using" is set to "Gradle"
"Use Gradle from" is set to "gradle-wrapper.properties"

However, if we create a Fat Jar with bootJar Gradle Task (also introduced by Gradle Plugin org.springframework.boot) and start that, the above issue does not manifest itself and I can access Camunda Cockpit.

The key difference we could identify is in org.camunda.bpm.webapp.plugin.resource.AbstractAppPluginRootResource#getPluginAssetAsStream as described in the following chapters.

Running as a Fat Jar

The following observations are based on running our Spring Boot application with Gradle or from within IntelliJ.

Let's only look at the browser's request for api/cockpit/plugin/cockpitPlugins/static/app/plugin.js?bust=7.11.0: This leads to the execution of org.camunda.bpm.webapp.plugin.resource.AbstractAppPluginRootResource#getPluginAssetAsStream where fileName is app/plugin.js. This leads to a call of getWebResourceAsStream(assetDirectory, fileName) which succeeds, i.e. returns an InputStream with the content of the requested file.

Running with Gradle/IntelliJ

The following observations are based on running our Spring Boot application as a Fat Jar, but still with an attached Debugger: Ran the JAR with IntelliJ with an attached debugger.

Again, let's only look at the browser's request for api/cockpit/plugin/cockpitPlugins/static/app/plugin.js?bust=7.11.0: This leads to the execution of org.camunda.bpm.webapp.plugin.resource.AbstractAppPluginRootResource#getPluginAssetAsStream where fileName is app/plugin.js. This time the call of getWebResourceAsStream(assetDirectory, fileName) fails, i.e. it returns null. This leads to calling org.camunda.bpm.webapp.plugin.resource.AbstractAppPluginRootResource#getClasspathResourceAsStream, however this fails too by returning null.

Now to the interesting part: The call to org.camunda.bpm.webapp.plugin.resource.AbstractAppPluginRootResource#getClasspathResourceAsStream results in calling java.lang.ClassLoader#getResourceAsStream(resourceName) with resourceName having the value plugin/cockpit/app/plugin.js. This fails as already mentioned. But if we change plugin.getClass().getClassLoader().getResourceAsStream(resourceName) to plugin.getClass().getClassLoader().getResourceAsStream("META-INF/resources/" + resourceName) it works and returns an input stream.

Note that plugin.getClass().getClassLoader() is a ClassLoaders$AppClassLoader, if this helps.

Assumed issue

Right now I assume that "META-INF/resources" is missing and should have been added somewhere.
Edit: I am still debugging and now I'm not sure if "META-INF/resources" is missing or if getWebResourceAsStream(assetDirectory, fileName) should find the resource in case the application is started with Gradle/IntelliJ, but doesn't.

This is the controller panel for Smart Panels app

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screenshot-1.png
86 kB
15/Aug/19 10:13 AM

Assignee:: Tassilo Weidner

Reporter:: Gregor Wegberg

Votes:: 0 Vote for this issue

Watchers:: 7 Start watching this issue

Created:: 13/Aug/19 12:53 PM

Updated:: 22/Sep/21 5:12 PM

Resolved:: 27/Jul/20 9:59 AM

Details

Description

The Issue

Summary

Environment

Gradle Configuration

Identified Reason

Running as a Fat Jar

Running with Gradle/IntelliJ

Assumed issue

mgm-controller-panel

This is the controller panel for Smart Panels app

Attachments

Attachments

Activity

People

Dates

Salesforce