Cannot connect to JasperReports Server through JasperSoft Studio with a null pointer exception

java.lang.NullPointerException
    at java.security.Provider$ServiceKey.<init>(Provider.java:872)
    at java.security.Provider$ServiceKey.<init>(Provider.java:865)
    at java.security.Provider.getService(Provider.java:1039)
    at sun.security.jca.ProviderList.getService(ProviderList.java:332)
    at sun.security.jca.GetInstance.getInstance(GetInstance.java:157)
    at java.security.Security.getImpl(Security.java:695)
    at java.security.KeyStore.getInstance(KeyStore.java:848)
    at com.jaspersoft.studio.server.protocol.restv2.CertChainValidator.getDefaultKeyStore(CertChainValidator.java:88)
    at com.jaspersoft.studio.server.protocol.restv2.RestV2ConnectionJersey.connect(RestV2ConnectionJersey.java:147)
    at com.jaspersoft.studio.server.protocol.ProxyConnection.connect(ProxyConnection.java:102)
    at com.jaspersoft.studio.server.WSClientHelper.connect(WSClientHelper.java:76)
    at com.jaspersoft.studio.server.WSClientHelper.connectGetData(WSClientHelper.java:115)
    at com.jaspersoft.studio.server.ServerProvider.listServer(ServerProvider.java:406)
    at com.jaspersoft.studio.server.ServerProvider.access$0(ServerProvider.java:402)
    at com.jaspersoft.studio.server.ServerProvider$1.run(ServerProvider.java:357)
    at org.eclipse.core.internal.jobs.Worker.run(Worker.java:56)

How to overcome this problem?

Solution:

If the stack trace is like this, the most important part here for us is java.security.KeyStore.getInstance(KeyStore.java:848) and it indicates that JasperSoft Studio was not able to open the default keystore. This can happen because your global java settings are pointing to system keystore location instead. If you do java -version in the command line and see the following:

Picked up JAVA_TOOL_OPTIONS: -Djavax.net.ssl.trustStoreType=Windows-ROOT

This means that the system JVM is using the Windows certificate storage as default. This doesn't work for JasperSoft Studio. To avoid this problem add the the following line to {JSS Installation dir}/Jaspersoft Studio.ini file right below the -vmargs line:

-Djavax.net.ssl.keyStoreType=jks

Save and restart studio and then try to connect to JasperReports Server or open the keystore in the Windows->Preferences section.