Class cast exception during JWT initialization

[ghostbuster91]

I did everything like in docs, I downloaded the .pem file from Mission Control dashboard.
But following code:

        val sdk = PoyntSdk.builder().configure("config.properties").build()

Gives me such error:

java.lang.ClassCastException: org.bouncycastle.asn1.x509.SubjectPublicKeyInfo cannot be cast to org.bouncycastle.openssl.PEMKeyPair

	at co.poynt.api.sdk.JsonWebToken.init(JsonWebToken.java:50)
	at co.poynt.api.sdk.PoyntSdk$Builder.configure(PoyntSdk.java:117)
	at com.elpassion.blockchain.workshop.TestA.should (TestA.kt:12)
	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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)

[mll11]

Look at the downloaded pem file. It likely lists the public key then the private key, e.g:

-----BEGIN PUBLIC KEY-----
...
-----END PUBLIC KEY-----
-----BEGIN RSA PRIVATE KEY-----
...
-----END RSA PRIVATE KEY-----

Easiest fix is to edit pem file to remove public key since it is not used by client app, e.g:

-----BEGIN RSA PRIVATE KEY-----
...
-----END RSA PRIVATE KEY-----