Add null check.

tools.descartes.prisma.agent.wildfly/src/main/java/tools/descartes/prisma/agent/wildfly/deployment/ServerInstrumentationDeploymentProcessor.java

@@ -100,7 +100,10 @@ public class ServerInstrumentationDeploymentProcessor implements DeploymentUnitP
 		final WarMetaData metaData = deploymentUnit.getAttachment(WarMetaData.ATTACHMENT_KEY);
 		if (metaData != null) {
 			String serverNode = System.getProperty("jboss.node.name");
-			String root = metaData.getJBossWebMetaData().getContextRoot();
+			String root = null;
+			if (metaData.getJBossWebMetaData() != null) {
+				root = metaData.getJBossWebMetaData().getContextRoot();
+			}
 			if (root == null) {
 				root = eeModuleDescription.getModuleName();
 			}