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e48cd808b0
Since we are running web-server and different handling methods will be called from
different threads, it is more appropriate to use concurrent data structures
for exchanging information between threads.
Prior to this change I observed the following exception which is likely to be due `certPaths` not synchronized between threads:
```
Caused by: kotlin.KotlinNullPointerException
at net.corda.node.utilities.registration.RegistrationHandler$reply$1.invoke(NodeRegistrationTest.kt:151) ~[integrationTest/:?]
at net.corda.node.utilities.registration.RegistrationHandler$reply$1.invoke(NodeRegistrationTest.kt:122) ~[integrationTest/:?]
at net.corda.core.internal.InternalUtils.logElapsedTime(InternalUtils.kt:221) ~[corda-core-corda-4.0-snapshot.jar:?]
at net.corda.core.internal.InternalUtils.logElapsedTime(InternalUtils.kt:213) ~[corda-core-corda-4.0-snapshot.jar:?]
at net.corda.node.utilities.registration.RegistrationHandler.reply(NodeRegistrationTest.kt:149) ~[integrationTest/:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_161]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_161]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_161]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_161]
```
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