Stackoverflow error during startup after configuring a different TM

[malinthaprasan]

Description:

As per https://apim.docs.wso2.com/en/next/install-and-setup/setup/distributed-deployment/deploying-wso2-api-m-in-a-distributed-setup/#step-66-configure-and-start-the-gateway

Under "Step 6.5 - Configure and start the Gateway", if we configure TM like below, there will be an stackoverflow error during server startup.

$ ./wso2server.sh 
JAVA_HOME environment variable is set to /home/malintha/installed/jdk-8u231-linux-x64/jdk1.8.0_231
CARBON_HOME environment variable is set to /home/malintha/wso2apim/cur/testRC/wso2am-3.2.0-gw
Using Java memory options: -Xms256m -Xmx1024m
[2020-08-11 16:12:41,671]  WARN {org.wso2.config.mapper.ConfigParser} - Configurations Changed in :repository/conf/deployment.toml
[2020-08-11 16:12:41,673]  WARN {org.wso2.config.mapper.ConfigParser} - Overriding files in configuration directory /home/malintha/wso2apim/cur/testRC/wso2am-3.2.0-gw
java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.wso2.carbon.bootstrap.Bootstrap.loadClass(Bootstrap.java:70)
	at org.wso2.carbon.bootstrap.Bootstrap.main(Bootstrap.java:51)
Caused by: java.lang.StackOverflowError
	at net.consensys.cava.toml.MutableTomlTable.lambda$keyPathSet$1(MutableTomlTable.java:72)
	at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:267)
	at java.util.HashMap$EntrySpliterator.forEachRemaining(HashMap.java:1699)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
	at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
	at net.consensys.cava.toml.MutableTomlTable.keyPathSet(MutableTomlTable.java:92)
	at net.consensys.cava.toml.MutableTomlTable.lambda$keyPathSet$1(MutableTomlTable.java:80)
	at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:267)
	at java.util.HashMap$EntrySpliterator.forEachRemaining(HashMap.java:1699)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
	at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
	at net.consensys.cava.toml.MutableTomlTable.keyPathSet(MutableTomlTable.java:92)
	at net.consensys.cava.toml.MutableTomlTable.lambda$keyPathSet$1(MutableTomlTable.java:80)
	at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:267)
	at java.util.HashMap$EntrySpliterator.forEachRemaining(HashMap.java:1699)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
	at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
	at net.consensys.cava.toml.MutableTomlTable.keyPathSet(MutableTomlTable.java:92)
	at net.consensys.cava.toml.MutableTomlTable.lambda$keyPathSet$1(MutableTomlTable.java:80)

It needs to be fixed by interchanging the configs as [apim.throttling] at the top.

[apim.throttling]
throttle_decision_endpoints = ["tcp://localhost:5672"]

[[apim.throttling.url_group]]
traffic_manager_urls = ["tcp://localhost:9611"]
traffic_manager_auth_urls = ["ssl://localhost:9711"]