Service WMS Rendering process failed…because “fi” is null

khercouet · August 1, 2025, 12:01pm

Hello,

I’m trying to generate a preview of each layer using a client-side script in HTML/JavaScript.

Here’s a simplified version of the code:

<!DOCTYPE html>
<html lang="fr">
<body>
</body>
<script>
    <!-- This URL retuns wms name of each layer like 'workspace:name'
    const LAYER_URL = 'https://myserver/layer/layers';
    <!-- This URL is the WMS service of geoserver
    const WMS_URL = 'https://myserver/wms/';

    const LAYER_DEFAULT_PREVIEW_BBOX = '0.0000,5009377.0857,2494904.6032,7504281.6889';

    function getLayerPreviewUrl(layer) {
        const params = new URLSearchParams({
            service: 'WMS',
            request: 'GetMap',
            layers: layer.wmsName,
            format: 'image/png',
            transparent: 'true',
            version: '1.1.1',
            id: layer.id,
            width: '256',
            height: '256',
            srs: 'EPSG:3857',
            bbox: LAYER_DEFAULT_PREVIEW_BBOX,
        });

        return `${WMS_URL}?${params.toString()}`;
    }

    async function getLayerPreviews() {
        const layerResponse = await fetch(LAYER_URL);

        if (!layerResponse.ok) {
            throw new Error();
        }

        const layers = await layerResponse.json();

        const promises  = layers.map((layer) => fetch(getLayerPreviewUrl(layer)));

        await Promise.all(promises);
    }
    getLayerPreviews();
</script>
</html>

Problem

Some WMS requests fail and return a response with content-type application/vnd.ogc.se_xml and the following error:

<ServiceExceptionReport version="1.1.1">
  <ServiceException code="internalError">
    Rendering process failed. Layers: myworkspace:my_layer
    Cannot invoke "org.geotools.data.simple.SimpleFeatureIterator.close()" because "fi" is null
  </ServiceException>
</ServiceExceptionReport>

here full exception :

annot invoke &quot;org.geotools.data.simple.SimpleFeatureIterator.close()&quot; because &quot;fi&quot; is null
Details:
org.geoserver.platform.ServiceException: Rendering process failed. Layers: myworkspace:my_layer
	at org.geoserver.wms.map.RenderedImageMapOutputFormat.produceMap(RenderedImageMapOutputFormat.java:550)
	at org.geoserver.wms.map.RenderedImageMapOutputFormat.produceMap(RenderedImageMapOutputFormat.java:198)
	at org.geoserver.wms.map.RenderedImageMapOutputFormat.produceMap(RenderedImageMapOutputFormat.java:81)
	at org.geoserver.wms.GetMap.executeInternal(GetMap.java:327)
	at org.geoserver.wms.GetMap.run(GetMap.java:199)
	at org.geoserver.wms.GetMap.run(GetMap.java:113)
	at org.geoserver.wms.DefaultWebMapService.getMap(DefaultWebMapService.java:245)
	at org.geoserver.wms.DefaultWebMapService$$FastClassBySpringCGLIB$$1cd32ea1.invoke(&lt;generated&gt;)
	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:792)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:762)
	at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:89)
	at org.geoserver.cloud.autoconfigure.gwc.integration.WMSIntegrationAutoConfiguration$ForwardGetMapToGwcAspect.getMap(WMSIntegrationAutoConfiguration.java:149)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
	at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:634)
	at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:624)
	at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:72)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:762)
	at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:89)
	at org.geoserver.cloud.gwc.config.core.WebMapServiceCacheSeedingConfiguration$WmsGetMapSeedingAspect.getMap(WebMapServiceCacheSeedingConfiguration.java:69)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
	at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:634)
	at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:624)
	at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:72)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:762)
	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:762)
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:707)
	at org.geoserver.wms.DefaultWebMapService$$EnhancerBySpringCGLIB$$a257b2e9.getMap(&lt;generated&gt;)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:344)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
	at org.geoserver.kml.WebMapServiceKmlInterceptor.invoke(WebMapServiceKmlInterceptor.java:38)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
	at org.geoserver.ows.util.RequestObjectLogger.invoke(RequestObjectLogger.java:51)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:241)
	at jdk.proxy3/jdk.proxy3.$Proxy265.getMap(Unknown Source)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
	at org.geoserver.ows.Dispatcher.execute(Dispatcher.java:952)
	at org.geoserver.ows.Dispatcher.handleRequestInternal(Dispatcher.java:271)
	at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:177)
	at org.geoserver.cloud.wms.controller.WMSController.dispatch(WMSController.java:124)
	at org.geoserver.cloud.wms.controller.WMSController.handleGet(WMSController.java:69)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150)
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:903)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:809)
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1072)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:965)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:529)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:623)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:199)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.geoserver.cloud.logging.mdc.servlet.MDCAuthenticationFilter.doFilter(MDCAuthenticationFilter.java:47)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:352)
	at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:68)
	at org.springframework.security.web.access.intercept.AuthorizationFilter.doFilter(AuthorizationFilter.java:100)
	at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:72)
	at org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:89)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:361)
	at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:68)
	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:126)
	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:120)
	at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:72)
	at org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:89)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:361)
	at org.geoserver.security.filter.GeoServerAnonymousAuthenticationFilter.doFilter(GeoServerAnonymousAuthenticationFilter.java:52)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:361)
	at org.geoserver.security.filter.GeoServerPreAuthenticationFilter.doFilter(GeoServerPreAuthenticationFilter.java:70)
	at org.geoserver.security.filter.GeoServerRequestHeaderAuthenticationFilter.doFilter(GeoServerRequestHeaderAuthenticationFilter.java:59)
	at org.geoserver.cloud.security.gateway.sharedauth.GatewaySharedAuthenticationFilter$ClientFilter.doFilter(GatewaySharedAuthenticationFilter.java:160)
	at org.geoserver.cloud.security.gateway.sharedauth.GatewaySharedAuthenticationFilter.doFilter(GatewaySharedAuthenticationFilter.java:129)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:361)
	at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:68)
	at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilterInternal(BasicAuthenticationFilter.java:168)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
	at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:72)
	at org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:89)
	at org.geoserver.security.filter.GeoServerBasicAuthenticationFilter.doFilter(GeoServerBasicAuthenticationFilter.java:80)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:361)
	at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:68)
	at org.geoserver.security.filter.GeoServerSecurityContextPersistenceFilter$1.doFilterInternal(GeoServerSecurityContextPersistenceFilter.java:66)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
	at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:72)
	at org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:89)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:361)
	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:225)
	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:190)
	at org.geoserver.security.GeoServerSecurityFilterChainProxy.doFilter(GeoServerSecurityFilterChainProxy.java:139)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.geoserver.cloud.logging.mdc.servlet.SpringEnvironmentMdcFilter.doFilterInternal(SpringEnvironmentMdcFilter.java:70)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.geoserver.cloud.logging.mdc.servlet.HttpRequestMdcFilter.doFilterInternal(HttpRequestMdcFilter.java:86)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.geoserver.cloud.gwc.config.core.GeoWebCacheCoreConfiguration$SetRequestPathInfoFilter.doFilter(GeoWebCacheCoreConfiguration.java:261)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.springframework.security.oauth2.client.filter.OAuth2ClientContextFilter.doFilter(OAuth2ClientContextFilter.java:64)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.geoserver.filters.HTTPMethodFilter.doFilter(HTTPMethodFilter.java:36)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.geoserver.filters.LoggingFilter.doFilter(LoggingFilter.java:181)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.geoserver.filters.ThreadLocalsCleanupFilter.doFilter(ThreadLocalsCleanupFilter.java:28)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.geoserver.platform.AdvancedDispatchFilter.doFilter(AdvancedDispatchFilter.java:39)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:70)
	at org.geoserver.filters.HTTPMethodFilter.doFilter(HTTPMethodFilter.java:36)
	at org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:67)
	at org.geoserver.filters.LoggingFilter.doFilter(LoggingFilter.java:181)
	at org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:67)
	at org.geoserver.filters.SpringDelegatingFilter.doFilter(SpringDelegatingFilter.java:41)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.geoserver.filters.FlushSafeFilter.doFilter(FlushSafeFilter.java:42)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.geoserver.cloud.logging.accesslog.AccessLogServletFilter.doFilterInternal(AccessLogServletFilter.java:74)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:96)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.geoserver.cloud.logging.mdc.servlet.MDCCleaningFilter.doFilterInternal(MDCCleaningFilter.java:54)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.springframework.web.filter.ForwardedHeaderFilter.doFilterInternal(ForwardedHeaderFilter.java:156)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:168)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:130)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:346)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:397)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:935)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1792)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1189)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:658)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63)
	at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException: Cannot invoke &quot;org.geotools.data.simple.SimpleFeatureIterator.close()&quot; because &quot;fi&quot; is null
	at org.geotools.data.transform.TransformFeatureCollection.openIterator(TransformFeatureCollection.java:147)
	at org.geotools.feature.collection.AbstractFeatureCollection.features(AbstractFeatureCollection.java:66)
	at org.geotools.feature.collection.AbstractFeatureCollection.features(AbstractFeatureCollection.java:50)
	at org.geoserver.security.decorators.SecuredFeatureCollection.features(SecuredFeatureCollection.java:40)
	at org.geoserver.security.decorators.SecuredSimpleFeatureCollection.features(SecuredSimpleFeatureCollection.java:72)
	at org.geoserver.security.decorators.SecuredSimpleFeatureCollection.features(SecuredSimpleFeatureCollection.java:31)
	at org.geotools.renderer.lite.StreamingRenderer.drawPlain(StreamingRenderer.java:2489)
	at org.geotools.renderer.lite.StreamingRenderer.processStylers(StreamingRenderer.java:2149)
	at org.geotools.renderer.lite.StreamingRenderer.paint(StreamingRenderer.java:860)
	at org.geoserver.wms.map.RenderedImageMapOutputFormat.produceMap(RenderedImageMapOutputFormat.java:510)
	... 193 more

However, when I try each request individually (one at a time), it works without errors.

Stack:

GeoServer Cloud
PostGIS backend

Has anyone encountered this error before? Any ideas why it happens only when multiple requests are made in parallel?

Thanks in advance!

Peter · August 1, 2025, 12:56pm

Interesting observation @khercouet . Are you able to reproduce this problem with the default data bundled with GeoServer?

Peter

khercouet · August 4, 2025, 7:52am

Hello Peter,

No, I am not able to reproduce this issue using the default data bundled with GeoServer.
I’ve also attempted to reproduce it locally, but so far, the problem hasn’t occurred.
It appears that the issue only arises on our Integration platform.

We plan to update GeoServer Cloud, as we noticed a fix that might be relevant
GEOT-7726

But its not explains why we have this issue.

I let you know.

Peter · August 4, 2025, 5:12pm

If GEOT-7726 was fixed in GeoTools 34.0, 33.1, 32.3, then the fix should be included in GeoServer 2.28.0 (next month), 2.27.1, 2.26.3. Are you using one of these 2 latest versions, if not see if that helps you?

ref: Release Schedule · geoserver/geoserver Wiki · GitHub

Peter

khercouet · August 5, 2025, 7:10am

Yes, we are using GeoServer 2.27.0. I can confirm that upgrading GeoServer Cloud from v2.27.0.0 to v2.27.2.0 resolves the NullPointerException (NPE) related to GEOT-7726.

However, we are now seeing the following message, which may be related:

HikariPool layers - Connection is not available, request timed out after 314ms.

I’m not sure if this message is indirectly caused by the previous NPE (GEOT-7726). Does that seem logical to you, @Peter ?

To mitigate this, we increased the JNDI_DATASOURCES_LAYERS_CONNECTION_TIMEOUT from 250ms to 10000ms (10 seconds) — and that seems to have resolved the issue.

AlexGacon · August 5, 2025, 8:48am

Hi @khercouet,

The Hikari Pool errors are generally related to the PG config store and not the datastore itself.

Don’t hesitate to post also issues on GS Cloud GitHub project page (GitHub · Where software is built)!

Alexandre

khercouet · August 5, 2025, 12:05pm

Hello @AlexGacon ,

Thanks for your feedback.

If we encounter any bug clearly related to GS Cloud, I’ll make sure to open an issue on GitHub.

You’re right, the error seems more related to the PG config. I mentioned it because I think the NullPointerException may have masked the underlying issue.

Now, we need to look into optimizing the connection pool : idle settings, etc.
Also worth noting: we’re seeing some slow queries on certain layers (some taking over 20 seconds), which might explain why some connections aren’t being properly released. And the issue is always here (depends how many requests do we have)

I realize this discussion is going a bit beyond my initial post.

thanks again for your quick replies!