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Gradle tools installation cannot be exported

See original GitHub issue

"FAILED TO EXPORT hudson.plugins.gradle.GradleInstallation$DescriptorImpl\
    \ : \nio.jenkins.plugins.casc.ConfiguratorException: Can't read attribute 'installations'\
    \ from hudson.plugins.gradle.GradleInstallation$DescriptorImpl@36972d3a\n\tat\
    \ io.jenkins.plugins.casc.Attribute._getValue(Attribute.java:252)\n\tat io.jenkins.plugins.casc.Attribute.getValue(Attribute.java:166)\n\
    \tat io.jenkins.plugins.casc.Attribute.equals(Attribute.java:199)\n\tat io.jenkins.plugins.casc.BaseConfigurator.compare(BaseConfigurator.java:336)\n\
    \tat io.jenkins.plugins.casc.impl.configurators.DescriptorConfigurator.describe(DescriptorConfigurator.java:65)\n\
    \tat io.jenkins.plugins.casc.impl.configurators.GlobalConfigurationCategoryConfigurator.describe(GlobalConfigurationCategoryConfigurator.java:94)\n\
    \tat io.jenkins.plugins.casc.impl.configurators.GlobalConfigurationCategoryConfigurator.lambda$describe$6(GlobalConfigurationCategoryConfigurator.java:87)\n\
    \tat java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)\n\
    \tat java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)\n\
    \tat java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)\n\
    \tat java.util.Iterator.forEachRemaining(Iterator.java:116)\n\tat java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)\n\
    \tat java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)\n\t\
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)\n\
    \tat java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)\n\
    \tat java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)\n\
    \tat java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)\n\t\
    at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)\n\t\
    at io.jenkins.plugins.casc.impl.configurators.GlobalConfigurationCategoryConfigurator.describe(GlobalConfigurationCategoryConfigurator.java:87)\n\
    \tat io.jenkins.plugins.casc.impl.configurators.GlobalConfigurationCategoryConfigurator.describe(GlobalConfigurationCategoryConfigurator.java:30)\n\
    \tat io.jenkins.plugins.casc.ConfigurationAsCode.export(ConfigurationAsCode.java:300)\n\
    \tat io.jenkins.plugins.casc.ConfigurationAsCode.doExport(ConfigurationAsCode.java:290)\n\
    \tat java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:627)\n\
    \tat org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:343)\n\t\
    at org.kohsuke.stapler.interceptor.RequirePOST$Processor.invoke(RequirePOST.java:77)\n\
    \tat org.kohsuke.stapler.PreInvokeInterceptedFunction.invoke(PreInvokeInterceptedFunction.java:26)\n\
    \tat org.kohsuke.stapler.Function.bindAndInvoke(Function.java:184)\n\tat org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:117)\n\
    \tat org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:129)\n\tat org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)\n\
    \tat org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)\n\tat org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)\n\
    \tat org.kohsuke.stapler.MetaClass$10.dispatch(MetaClass.java:374)\n\tat org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)\n\
    \tat org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)\n\tat org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)\n\
    \tat org.kohsuke.stapler.Stapler.service(Stapler.java:238)\n\tat javax.servlet.http.HttpServlet.service(HttpServlet.java:790)\n\
    \tat org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:860)\n\t\
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)\n\
    \tat hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154)\n\
    \tat org.jenkinsci.plugins.ssegateway.Endpoint$SSEListenChannelFilter.doFilter(Endpoint.java:225)\n\
    \tat hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:151)\n\
    \tat io.jenkins.blueocean.ResourceCacheControl.doFilter(ResourceCacheControl.java:134)\n\
    \tat hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:151)\n\
    \tat io.jenkins.blueocean.auth.jwt.impl.JwtAuthenticationFilter.doFilter(JwtAuthenticationFilter.java:61)\n\
    \tat hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:151)\n\
    \tat hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:157)\n\t\
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)\n\
    \tat hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:99)\n\tat org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)\n\
    \tat hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)\n\
    \tat hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)\n\
    \tat hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)\n\
    \tat jenkins.security.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:117)\n\
    \tat hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)\n\
    \tat org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)\n\
    \tat hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)\n\
    \tat org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)\n\
    \tat hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)\n\
    \tat org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)\n\
    \tat hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)\n\
    \tat jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:93)\n\
    \tat hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)\n\
    \tat org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)\n\
    \tat hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:67)\n\
    \tat hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)\n\
    \tat hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:90)\n\
    \tat hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171)\n\tat org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)\n\
    \tat org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)\n\
    \tat org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)\n\
    \tat hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:82)\n\
    \tat org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)\n\
    \tat org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)\n\
    \tat org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)\n\
    \tat org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)\n\
    \tat org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)\n\
    \tat org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)\n\
    \tat org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)\n\
    \tat org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:190)\n\
    \tat org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)\n\
    \tat org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:188)\n\
    \tat org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1253)\n\
    \tat org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:168)\n\
    \tat org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)\n\
    \tat org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)\n\
    \tat org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:166)\n\
    \tat org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1155)\n\
    \tat org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)\n\
    \tat org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)\n\
    \tat org.eclipse.jetty.server.Server.handle(Server.java:530)\n\tat org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:347)\n\
    \tat org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:256)\n\
    \tat org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279)\n\
    \tat org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)\n\tat org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124)\n\
    \tat org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:247)\n\
    \tat org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:140)\n\
    \tat org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131)\n\
    \tat org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:382)\n\
    \tat winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)\n\t\
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)\n\
    \tat java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)\n\
    \tat java.lang.Thread.run(Thread.java:748)\nCaused by: java.lang.reflect.InvocationTargetException\n\
    \tat sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)\n\tat sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)\n\
    \tat sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)\n\
    \tat java.lang.reflect.Method.invoke(Method.java:498)\n\tat io.jenkins.plugins.casc.Attribute._getValue(Attribute.java:234)\n\
    \t... 104 more\nCaused by: java.lang.NullPointerException\n\tat hudson.plugins.gradle.GradleInstallation$DescriptorImpl.getInstallations(GradleInstallation.java:121)\n\
    \tat hudson.plugins.gradle.GradleInstallation$DescriptorImpl.getInstallations(GradleInstallation.java:98)\n\
    \t... 109 more\n"

It appears that installations returns null for this code:

    @Extension @Symbol("gradle")
    public static class DescriptorImpl extends ToolDescriptor<GradleInstallation> {

        public DescriptorImpl() {
        }

        @Inject
        private Gradle.DescriptorImpl gradleDescriptor;

        @Override
        public String getDisplayName() {
            return Messages.installer_displayName();
        }

        @Override
        public List<? extends ToolInstaller> getDefaultInstallers() {
            return Collections.singletonList(new GradleInstaller(null));
        }

        // for compatibility reasons, the persistence is done by GradleBuilder.DescriptorImpl

        @Override
        public GradleInstallation[] getInstallations() {
            return gradleDescriptor.getInstallations();
        }

        @Override
        public void setInstallations(GradleInstallation... installations) {
            gradleDescriptor.setInstallations(installations);
        }

    }

When we export, gradleDescriptor is null