Torsten Mielke created CAMEL-23183:
--------------------------------------
Summary: [camel-jbang-mcp] ClassNotFoundException:
org.apache.camel.catalog.impl.AbstractCamelCatalog
Key: CAMEL-23183
URL: https://issues.apache.org/jira/browse/CAMEL-23183
Project: Camel
Issue Type: Bug
Affects Versions: 4.18.0
Environment: Camel JBang MCP server running in Cursor IDE, registered
according to docs with
{code}
{
"mcpServers": {
"camel": {
"command": "jbang",
"args": [
"-Dquarkus.log.level=INFO",
"org.apache.camel:camel-jbang-mcp:4.18.0:runner"
]
}
}
}
{code}
Reporter: Torsten Mielke
Camel JBang MCP server as managed by Cursor IDE may occasionally throw the
following error
{code}
2026-03-11 16:27:16.977 [info] Handling CallTool action for tool
'camel_catalog_components' with toolCallId:
tool_13575bea-faaf-40e5-a3fd-d1b94c09508
2026-03-11 16:27:16.978 [info] Calling tool 'camel_catalog_components' with
toolCallId: tool_13575bea-faaf-40e5-a3fd-d1b94c09508
2026-03-11 16:27:19.092 [error] 2026-03-11 16:27:19,089 ERROR
[io.quarkiverse.mcp.server.runtime.ToolMessageHandler] (executor-thread-1)
Unable to call tool camel_catalog_components: java.lang.NoClassDefFoundError:
org/apache/camel/catalog/impl/AbstractCamelCatalog
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1027)
at
java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150)
at
java.base/java.net.URLClassLoader.defineClass(URLClassLoader.java:524)
at java.base/java.net.URLClassLoader$1.run(URLClassLoader.java:427)
at java.base/java.net.URLClassLoader$1.run(URLClassLoader.java:421)
at
java.base/java.security.AccessController.doPrivileged(AccessController.java:714)
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:420)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:593)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
at
org.apache.camel.dsl.jbang.core.common.CatalogLoader.loadCatalog(CatalogLoader.java:77)
at
org.apache.camel.dsl.jbang.core.commands.mcp.CatalogTools.loadCatalog(CatalogTools.java:253)
at
org.apache.camel.dsl.jbang.core.commands.mcp.CatalogTools.camel_catalog_components(CatalogTools.java:65)
at
org.apache.camel.dsl.jbang.core.commands.mcp.CatalogTools_ClientProxy.camel_catalog_components(Unknown
Source)
at
org.apache.camel.dsl.jbang.core.commands.mcp.CatalogTools_camel_catalog_components_Invoker_pZTQHIEJbHWjGMKaLBlP6KnVsGU.invoke(Unknown
Source)
at
org.apache.camel.dsl.jbang.core.commands.mcp.CatalogTools_camel_catalog_components_LazyInvoker_pZTQHIEJbHWjGMKaLBlP6KnVsGU.invoke(Unknown
Source)
at
io.quarkiverse.mcp.server.runtime.FeatureManagerBase$FeatureMetadataInvoker.call(FeatureManagerBase.java:426)
at
io.quarkiverse.mcp.server.runtime.FeatureManagerBase$1.lambda$call$0(FeatureManagerBase.java:98)
at
io.smallrye.context.impl.wrappers.SlowContextualFunction.apply(SlowContextualFunction.java:21)
at
io.smallrye.mutiny.operators.uni.UniOnItemTransformToUni$UniOnItemTransformToUniProcessor.performInnerSubscription(UniOnItemTransformToUni.java:68)
at
io.smallrye.mutiny.operators.uni.UniOnItemTransformToUni$UniOnItemTransformToUniProcessor.onItem(UniOnItemTransformToUni.java:57)
at
io.smallrye.mutiny.operators.uni.builders.UniCreateFromKnownItem$KnownItemSubscription.forward(UniCreateFromKnownItem.java:42)
at
io.smallrye.mutiny.operators.uni.builders.UniCreateFromKnownItem.subscribe(UniCreateFromKnownItem.java:23)
at
io.smallrye.mutiny.operators.AbstractUni.subscribe(AbstractUni.java:35)
at
io.smallrye.mutiny.operators.uni.UniOnItemTransformToUni.subscribe(UniOnItemTransformToUni.java:25)
at
io.smallrye.mutiny.operators.AbstractUni.subscribe(AbstractUni.java:35)
at
io.smallrye.mutiny.operators.uni.UniOnItemOrFailureFlatMap.subscribe(UniOnItemOrFailureFlatMap.java:27)
at
io.smallrye.mutiny.operators.AbstractUni.subscribe(AbstractUni.java:35)
at
io.smallrye.mutiny.groups.UniSubscribe.withSubscriber(UniSubscribe.java:51)
at io.smallrye.mutiny.groups.UniSubscribe.with(UniSubscribe.java:110)
at io.smallrye.mutiny.groups.UniSubscribe.with(UniSubscribe.java:88)
at
io.quarkiverse.mcp.server.runtime.FeatureManagerBase$3.call(FeatureManagerBase.java:340)
at
io.quarkiverse.mcp.server.runtime.FeatureManagerBase$3.call(FeatureManagerBase.java:336)
at
io.vertx.core.impl.ContextImpl.lambda$executeBlocking$4(ContextImpl.java:192)
at io.vertx.core.impl.ContextInternal.dispatch(ContextInternal.java:270)
at io.vertx.core.impl.ContextImpl$1.execute(ContextImpl.java:221)
at io.vertx.core.impl.WorkerTask.run(WorkerTask.java:56)
at
io.quarkus.vertx.core.runtime.VertxCoreRecorder$15.runWith(VertxCoreRecorder.java:666)
at
org.jboss.threads.EnhancedQueueExecutor$Task.doRunWith(EnhancedQueueExecutor.java:2651)
at
org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2630)
at
org.jboss.threads.EnhancedQueueExecutor.runThreadBody(EnhancedQueueExecutor.java:1622)
at
org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1589)
at org.jboss.threads.DelegatingRunnable.run(DelegatingRunnable.java:11)
at
org.jboss.threads.ThreadLocalResettingRunnable.run(ThreadLocalResettingRunnable.java:11)
at
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:1583)
Caused by: java.lang.ClassNotFoundException:
org.apache.camel.catalog.impl.AbstractCamelCatalog
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:445)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:593)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
... 46 more
undefined
2026-03-11 16:27:19.101 [error] Error calling tool 'camel_catalog_components':
MCP error -32603: Internal error MCP error -32603: Internal error
{code}
This seems somewhat intermittent as in the same log later it seems to handle
the request just fine
{code}
2026-03-11 16:31:19.835 [info] Handling CallTool action for tool
'camel_catalog_components' with toolCallId:
tool_ed4ab2aa-7e8c-4227-bf9a-c4458f7aadd
2026-03-11 16:31:19.835 [info] Calling tool 'camel_catalog_components' with
toolCallId: tool_ed4ab2aa-7e8c-4227-bf9a-c4458f7aadd
2026-03-11 16:31:20.276 [info] Successfully called tool
'camel_catalog_components'
{code}
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