SYMPTOM

When trying to start the Runtime, the following error message is displayed on the standard output and/or in the log file "com.indy.engine.42000.log" :

ERROR - Error during Log initialization
com.indy.engine.common.exceptions.EngineExceptionI: Error during connection
    at com.indy.engine.userLog.e.a(SourceFile:742)
    at com.indy.engine.userLog.RdbmsUserLog.connect(SourceFile:4631)
    at com.indy.engine.userLog.a.c.c(SourceFile:110)
    at com.indy.engine.userLog.a.a.b(SourceFile:277)
    at com.indy.engine.f.c(SourceFile:147)
    at com.indy.engine.EngineStartI.main(SourceFile:359)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.rzo.yajsw.app.WrapperJVMMain.executeMain(WrapperJVMMain.java:53)
    at org.rzo.yajsw.app.WrapperJVMMain.main(WrapperJVMMain.java:36)
Caused by: java.lang.ClassNotFoundException: com.microsoft.sqlserver.jdbc.SQLServerDriver

The last line may refer to the technology of the log database (Oracle, H2, DB2...).

SOLUTIONS

Check that the jar file of the JDBC driver corresponding to your Log database is placed in the directory "stambiaRuntime/lib/jdbc".