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WMS GetCapabilities requests will throw a ConcurrentModificationException.
In my environment, this is 100% reproducible by making the GetCapabilities request without any configuration modifications happening.
Based upon my understanding, I believe the error happens whenever the inner if block removes an element from the map.
The bug should only impact some custom dimensions.
https://stackoverflow.com/questions/49688057/can-i-use-keyset-to-modify-hashmap-during-iteration
DimensionHelper (block around line 233)
// Process only custom dimensions supported by the reader
if (hasCustomDimensions) {
for (String key : customDimensions.keySet())
{ if (!dimensions.hasDomain(key)) customDimensions.remove(key); }
}
2018-10-10 10:09:38,232 WARN [wms.capabilities] - Error writing metadata; skipping layer: EchoBottomsMosaicFlagsForPrecipLevel
java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437)
at java.util.HashMap$KeyIterator.next(HashMap.java:1461)
at org.geoserver.wms.capabilities.DimensionHelper.handleRasterLayerDimensions(DimensionHelper.java:233)
at org.geoserver.wms.capabilities.Capabilities_1_3_0_Transformer$Capabilities_1_3_0_Translator.handleLayer(Capabilities_1_3_0_Transformer.java:1015)
at org.geoserver.wms.capabilities.Capabilities_1_3_0_Transformer$Capabilities_1_3_0_Translator.doHandleLayer(Capabilities_1_3_0_Transformer.java:936)
at org.geoserver.wms.capabilities.Capabilities_1_3_0_Transformer$Capabilities_1_3_0_Translator.handleLayerTree(Capabilities_1_3_0_Transformer.java:896)
at org.geoserver.wms.capabilities.Capabilities_1_3_0_Transformer$Capabilities_1_3_0_Translator.handleLayers(Capabilities_1_3_0_Transformer.java:734)
at org.geoserver.wms.capabilities.Capabilities_1_3_0_Transformer$Capabilities_1_3_0_Translator.handleCapability(Capabilities_1_3_0_Transformer.java:478)
at org.geoserver.wms.capabilities.Capabilities_1_3_0_Transformer$Capabilities_1_3_0_Translator.encode(Capabilities_1_3_0_Transformer.java:288)
at org.geotools.xml.transform.TransformerBase$XMLReaderSupport.parse(TransformerBase.java:996)
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transformIdentity(TransformerImpl.java:668)
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:737)
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:351)
at org.geotools.xml.transform.TransformerBase$Task.run(TransformerBase.java:284)
at org.geotools.xml.transform.TransformerBase.transform(TransformerBase.java:119)
at org.geotools.xml.transform.TransformerBase.transform(TransformerBase.java:101)
at org.geoserver.wms.capabilities.Capabilities_1_3_0_Response.write(Capabilities_1_3_0_Response.java:43)
at org.geoserver.config.CapabilitiesCacheHeadersCallback$RevalidateTagResponse.write(CapabilitiesCacheHeadersCallback.java:144)
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