503 Service Unavailable Error: Application cannot be started

Error Log

std_server0.out log from java work directory (/usr/sap/<SID>/<instance>/work) has the entries:
Service [tc~je~webservices~srv] start ================= ERROR =================

CSN Component [BC-ESI-WS-JAV-RT], DC Name [sap.com/tc~je~webservices~srv]

java.lang.NoClassDefFoundError: com/sap/engine/services/webservices/espbase/client/dsr/DSRFacade

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Class.java:249)

Caused by: java.lang.ClassNotFoundException: com.sap.engine.services.webservices.espbase.client.dsr.DSRFacade

Solution

This error suggests that the SAP system is encountering a NoClassDefFoundError for the class com.sap.engine.services.webservices.espbase.client.dsr.DSRFacade when attempting to start the tc~je~webservices~srv service. This can happen due to several reasons:

1. Missing Library: The most frequent reason for this error is that the classpath does not contain the necessary library or JAR file that contains the DSRFacade class. Verify the availability and correct referencing of all required SAP libraries, particularly those about online services.

2. ClassLoader Configuration: The class loader in the Java environment may not be set up properly to locate the required classes. Verify your SAP Java environment's classpath setup and Java settings.

3. Corrupted Deployment: Sometimes, an incomplete or corrupted deployment of a Java package can cause issues. Try redeploying or reinstalling the component associated with tc~je~webservices~srv.

4. Outdated Software Component Version: The error could also occur if you’re using an outdated component version. Ensure your SAP Java stack is up to date and compatible with the installed components.

5. Cache or Compilation Issues: Class loading problems caused by outdated or corrupted cache data can occasionally be fixed by clearing the Java cache or restarting the instance.

Steps to Resolve

• Verify Classpath: Make sure your SAP Java library directories contain espbase.jar or the corresponding JAR containing DSRFacade.
• Update/Restart Service: Using the SAP Management Console, attempt to update or restart the tc~je~webservices~srv service.
• Log Analysis: To get more details about the behavior of the class loader, examine other logs (such as dev_server0 and defaultTrace.trc).
• Patch Management: Check for any updates or patches about BC-ESI-WS-JAV-RT (Web Services Runtime) in the SAP Marketplace .