The following probe template which does not supply a description or event path

<jfragent>
<config>
<classprefix>__JFREvent</classprefix>
<allowtostring>true</allowtostring>
<allowconverter>true</allowconverter>
</config>
<events>
<event id="new_preset_2.event.1">
<label>New Custom Event</label>
<class>com.jmatsuok.random.things.TestDummy</class>
<stacktrace>true</stacktrace>
<rethrow>true</rethrow>
<location>EXIT</location>
<method>
<name>Test</name>
<descriptor>()V</descriptor>
</method>
</event>
</events>
</jfragent>

Will cause the agent to fail to define event classes

SEVERE: Failed to generate event class for JFRTransformDescriptor method:Test()V, eventName:New Custom Event, #params:0
java.lang.IllegalArgumentException: value null
at org.openjdk.jmc.internal.org.objectweb.asm.SymbolTable.addConstant(SymbolTable.java:501)
at org.openjdk.jmc.internal.org.objectweb.asm.AnnotationWriter.visit(AnnotationWriter.java:259)
at org.openjdk.jmc.agent.jfr.impl.JFREventClassGenerator.generateClassAnnotations(JFREventClassGenerator.java:228)
at org.openjdk.jmc.agent.jfr.impl.JFREventClassGenerator.generateEventClass(JFREventClassGenerator.java:70)
at org.openjdk.jmc.agent.jfr.impl.JFRClassVisitor.generateEventClass(JFRClassVisitor.java:109)
at org.openjdk.jmc.agent.jfr.impl.JFRClassVisitor.visitEnd(JFRClassVisitor.java:89)
at org.openjdk.jmc.internal.org.objectweb.asm.ClassReader.accept(ClassReader.java:722)
at org.openjdk.jmc.internal.org.objectweb.asm.ClassReader.accept(ClassReader.java:401)
at org.openjdk.jmc.agent.Transformer.doJFRLogging(Transformer.java:103)
at org.openjdk.jmc.agent.Transformer.doTransform(Transformer.java:84)
at org.openjdk.jmc.agent.Transformer.doTransforms(Transformer.java:74)
at org.openjdk.jmc.agent.Transformer.transform(Transformer.java:62)
at java.instrument/java.lang.instrument.ClassFileTransformer.transform(ClassFileTransformer.java:246)
at java.instrument/sun.instrument.TransformerManager.transform(TransformerManager.java:188)
at java.instrument/sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:563)
at java.instrument/sun.instrument.InstrumentationImpl.retransformClasses0(Native Method)
at java.instrument/sun.instrument.InstrumentationImpl.retransformClasses(InstrumentationImpl.java:167)
at org.openjdk.jmc.agent.jmx.AgentController.defineEventProbes(AgentController.java:79)
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:566)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
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:566)
at java.base/sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:260)
at java.management/com.sun.jmx.mbeanserver.ConvertingMethod.invokeWithOpenReturn(ConvertingMethod.java:193)
at java.management/com.sun.jmx.mbeanserver.ConvertingMethod.invokeWithOpenReturn(ConvertingMethod.java:175)
at java.management/com.sun.jmx.mbeanserver.MXBeanIntrospector.invokeM2(MXBeanIntrospector.java:117)
at java.management/com.sun.jmx.mbeanserver.MXBeanIntrospector.invokeM2(MXBeanIntrospector.java:54)
at java.management/com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java:237)
at java.management/com.sun.jmx.mbeanserver.PerInterface.invoke(PerInterface.java:138)
at java.management/com.sun.jmx.mbeanserver.MBeanSupport.invoke(MBeanSupport.java:252)
at java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:809)
at java.management/com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1466)
at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1307)
at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1399)
at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:827)
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:566)
at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:359)
at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)
at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)
at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:562)
at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:796)
at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:677)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:676)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)