Configuration mentioned at Hashicope Vault doc doesn't work

Description:

Documentation contains below.

[[external_vault]]
name = "hashicorp"
address = "http://127.0.0.1:8200"
# If Static Token authentication is used, apply the rootToken:
rootToken = "ROOT_TOKEN"
# If AppRole Pull authentication is used, apply the roleId and secretId:
roleId = "ROLE_ID"
secretId = "SECRET_ID"
cachableDuration = 15000
engineVersion = 2
namespace = "NAMESPACE"
trustStoreFile = "${carbon.home}/repository/resources/security/client-truststore.jks"
keyStoreFile = "${carbon.home}/repository/resources/security/wso2carbon.jks"
keyStorePassword = "KEY_STORE_PASSWORD"

When applied got below error.

[2021-03-09 15:25:41,063] ERROR {SynapseXPath} - Evaluation of the XPath expression hashicorp:vault-lookup('ei-secrets/dev', 'test3') resulted in an error org.jaxen.FunctionCallException: Error while initializing the secure vault configs
	at org.wso2.micro.integrator.mediation.security.vault.external.hashicorp.HashiCorpVaultLookupFunction.call(HashiCorpVaultLookupFunction.java:101)
	at org.jaxen.expr.DefaultFunctionCallExpr.evaluate(DefaultFunctionCallExpr.java:181)
	at org.jaxen.expr.DefaultXPathExpr.asList(DefaultXPathExpr.java:102)
	at org.jaxen.BaseXPath.selectNodesForContext(BaseXPath.java:675)
	at org.jaxen.BaseXPath.selectNodes(BaseXPath.java:215)
	at org.jaxen.BaseXPath.evaluate(BaseXPath.java:175)
	at org.apache.synapse.util.xpath.SynapseXPath.stringValueOf(SynapseXPath.java:410)
	at org.apache.synapse.mediators.builtin.PropertyMediator.getResultValue(PropertyMediator.java:410)
	at org.apache.synapse.mediators.builtin.PropertyMediator.mediate(PropertyMediator.java:133)
	at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:109)
	at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:71)
	at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:158)
	at org.apache.synapse.api.Resource.process(Resource.java:342)
	at org.apache.synapse.api.API.process(API.java:465)
	at org.apache.synapse.api.AbstractApiHandler.apiProcess(AbstractApiHandler.java:93)
	at org.apache.synapse.api.AbstractApiHandler.dispatchToAPI(AbstractApiHandler.java:71)
	at org.apache.synapse.api.rest.RestRequestHandler.dispatchToAPI(RestRequestHandler.java:75)
	at org.apache.synapse.api.rest.RestRequestHandler.process(RestRequestHandler.java:67)
	at org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:54)
	at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:344)
	at org.apache.synapse.core.axis2.SynapseMessageReceiver.receive(SynapseMessageReceiver.java:99)
	at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
	at org.apache.synapse.transport.passthru.ServerWorker.processNonEntityEnclosingRESTHandler(ServerWorker.java:369)
	at org.apache.synapse.transport.passthru.ServerWorker.processEntityEnclosingRequest(ServerWorker.java:428)
	at org.apache.synapse.transport.passthru.ServerWorker.run(ServerWorker.java:182)
	at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: org.wso2.micro.integrator.mediation.security.vault.external.ExternalVaultException: Error while initializing the secure vault configs
	at org.wso2.micro.integrator.mediation.security.vault.external.hashicorp.HashiCorpVaultLookupHandlerImpl.<init>(HashiCorpVaultLookupHandlerImpl.java:76)
	at org.wso2.micro.integrator.mediation.security.vault.external.hashicorp.HashiCorpVaultLookupHandlerImpl.getDefaultSecurityService(HashiCorpVaultLookupHandlerImpl.java:82)
	at org.wso2.micro.integrator.mediation.security.vault.external.hashicorp.HashiCorpVaultLookupFunction.call(HashiCorpVaultLookupFunction.java:98)
	... 28 more
Caused by: org.wso2.micro.integrator.mediation.security.vault.external.ExternalVaultException: Required configurations of the hashicorp secure vault can not found
	at org.wso2.micro.integrator.mediation.security.vault.external.hashicorp.HashiCorpVaultLookupHandlerImpl.initialize(HashiCorpVaultLookupHandlerImpl.java:98)
	at org.wso2.micro.integrator.mediation.security.vault.external.hashicorp.HashiCorpVaultLookupHandlerImpl.<init>(HashiCorpVaultLookupHandlerImpl.java:74)
	... 30 more

Solution

Update below parameter as below.

cachableDuration = "15000"