java.sql.SQLException: [Amazon][JDBC](11380) Null pointer exception.

[jayakumarim]

I am getting below Exception while connecting to PostgreSQL. Please help to fix it.
I have correct values for URL. user& password.

java.sql.SQLException: [Amazon]JDBC Null pointer exception.
at com.amazon.redshift.client.PGClient.startSession(Unknown Source) ~[?:?]
at com.amazon.redshift.client.PGClient.(Unknown Source) ~[?:?]
at com.amazon.redshift.core.PGJDBCConnection.connect(Unknown Source) ~[?:?]
at com.amazon.jdbc.common.BaseConnectionFactory.doConnect(Unknown Source) ~[?:?]
at com.amazon.jdbc.common.AbstractDriver.connect(Unknown Source) ~[?:?]
at com.amazon.redshift.jdbc.Driver.connect(Unknown Source) ~[RedshiftJDBC42-1.2.10.1009.jar:?]
at java.sql.DriverManager.getConnection(DriverManager.java:677) ~[java.sql:?]
at java.sql.DriverManager.getConnection(DriverManager.java:228) ~[java.sql:?]
at com.alacriti.yaf.db.ConnectionSource.createConnection(ConnectionSource.java:224) [yaf-0.0.0-SNAPSHOT.jar:?]
at com.alacriti.yaf.db.ConnectionSource.createPoolObject(ConnectionSource.java:154) [yaf-0.0.0-SNAPSHOT.jar:?]
at com.alacriti.yaf.pool.Pool.initialize(Pool.java:95) [yaf-0.0.0-SNAPSHOT.jar:?]
at com.alacriti.yaf.pool.Pool.(Pool.java:62) [yaf-0.0.0-SNAPSHOT.jar:?]
at com.alacriti.yaf.db.ConnectionSource.init(ConnectionSource.java:128) [yaf-0.0.0-SNAPSHOT.jar:?]
at com.alacriti.yaf.db.ConnectionSources.init(ConnectionSources.java:70) [yaf-0.0.0-SNAPSHOT.jar:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:566) ~[?:?]
at com.alacriti.yaf.resources.Resources.createHandlerInstance(Resources.java:851) [yaf-0.0.0-SNAPSHOT.jar:?]
at com.alacriti.yaf.resources.Resources.createObject(Resources.java:585) [yaf-0.0.0-SNAPSHOT.jar:?]
at com.alacriti.yaf.resources.Resources.initObjects(Resources.java:572) [yaf-0.0.0-SNAPSHOT.jar:?]
at com.alacriti.yaf.resources.Resources.initResources(Resources.java:512) [yaf-0.0.0-SNAPSHOT.jar:?]
at com.alacriti.yaf.resources.Resources.initBootFile(Resources.java:388) [yaf-0.0.0-SNAPSHOT.jar:?]
at com.alacriti.yaf.resources.Resources.init(Resources.java:207) [yaf-0.0.0-SNAPSHOT.jar:?]
at com.alacriti.etl.daemon.listener.ResourceInitServlet.initYAFconfig(ResourceInitServlet.java:999) [etl-daemon-0.0.0-SNAPSHOT.jar:?]
at com.alacriti.etl.daemon.listener.ResourceInitServlet.initAll(ResourceInitServlet.java:236) [etl-daemon-0.0.0-SNAPSHOT.jar:?]
at com.alacriti.etl.daemon.listener.ResourceInitServlet.init(ResourceInitServlet.java:110) [etl-daemon-0.0.0-SNAPSHOT.jar:?]
at io.undertow.servlet.core.LifecyleInterceptorInvocation.proceed(LifecyleInterceptorInvocation.java:117) [undertow-servlet-1.4.18.Final.jar:1.4.18.Final]
at io.undertow.servlet.core.ManagedServlet$DefaultInstanceStrategy.start(ManagedServlet.java:250) [undertow-servlet-1.4.18.Final.jar:1.4.18.Final]
at io.undertow.servlet.core.ManagedServlet.createServlet(ManagedServlet.java:133) [undertow-servlet-1.4.18.Final.jar:1.4.18.Final]
at io.undertow.servlet.core.DeploymentManagerImpl$2.call(DeploymentManagerImpl.java:565) [undertow-servlet-1.4.18.Final.jar:1.4.18.Final]
at io.undertow.servlet.core.DeploymentManagerImpl$2.call(DeploymentManagerImpl.java:536) [undertow-servlet-1.4.18.Final.jar:1.4.18.Final]
at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:42) [undertow-servlet-1.4.18.Final.jar:1.4.18.Final]
at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43) [undertow-servlet-1.4.18.Final.jar:1.4.18.Final]
at io.undertow.servlet.core.DeploymentManagerImpl.start(DeploymentManagerImpl.java:578) [undertow-servlet-1.4.18.Final.jar:1.4.18.Final]
at com.alacriti.serverless.undertow.server.ServicesServer.deployServletsToContainer(ServicesServer.java:477) [undertow-server-1.0.0.jar:?]
at com.alacriti.serverless.undertow.server.ServicesServer.start(ServicesServer.java:272) [undertow-server-1.0.0.jar:?]
at com.alacriti.serverless.undertow.server.ServicesServer.main(ServicesServer.java:794) [undertow-server-1.0.0.jar:?]
Caused by: java.lang.NullPointerException