Oracle REST Data Services Unavailable -- java.sql.SQLException: Unable to start the Universal Connection Pool

[chandra sekhar]

Hi,

We were recently installed and configured Apex on two servers and did the
Load balance.We were facing the issue like "Oracle REST Data Services
Unavailable" and we found the below error messages in the catalina.out Can
anybody suggest me.

Error Message:
==========
Caused by: java.sql.SQLException: Unable to start the Universal Connection
Pool: oracle.ucp.UniversalConnectionPoolException: Failed to create
initialPoolSize connections while starting a pool:
java.lang.IllegalArgumentException: empty service member name
        at
oracle.ucp.util.UCPErrorHandler.newSQLException(UCPErrorHandler.java:456)
        at
oracle.ucp.util.UCPErrorHandler.throwSQLException(UCPErrorHandler.java:133)
        at
oracle.ucp.jdbc.PoolDataSourceImpl.startPool(PoolDataSourceImpl.java:942)
        at
oracle.ucp.jdbc.PoolDataSourceImpl.getConnection(PoolDataSourceImpl.java:1969)
        at
oracle.ucp.jdbc.PoolDataSourceImpl.access$500(PoolDataSourceImpl.java:198)
        at
oracle.ucp.jdbc.PoolDataSourceImpl$30.build(PoolDataSourceImpl.java:4353)
        at
oracle.ucp.jdbc.PoolDataSourceImpl.getConnection(PoolDataSourceImpl.java:1924)
        at
oracle.ucp.jdbc.PoolDataSourceImpl.getConnection(PoolDataSourceImpl.java:1901)
        at
oracle.dbtools.common.jdbc.DataSourceConnection.getConnection(DataSourceConnection.java:46)
        at
oracle.dbtools.common.pools.DataSourceTargetImpl.connection(DataSourceTargetImpl.java:41)
        at
oracle.dbtools.url.mapping.db.DatabaseURLMappingImpl.injectPool(DatabaseURLMappingImpl.java:383)
        ... 50 more
Caused by: oracle.ucp.UniversalConnectionPoolException: Failed to create
initialPoolSize connections while starting a pool:
java.lang.IllegalArgumentException: empty service member name
        at
oracle.ucp.util.UCPErrorHandler.newUniversalConnectionPoolException(UCPErrorHandler.java:336)
        at
oracle.ucp.util.UCPErrorHandler.throwUniversalConnectionPoolException(UCPErrorHandler.java:59)
        at oracle.ucp.common.Core.initialize(Core.java:1307)
        at
oracle.ucp.common.UniversalConnectionPoolBase.start(UniversalConnectionPoolBase.java:725)
        at
oracle.ucp.jdbc.oracle.OracleJDBCConnectionPool.start(OracleJDBCConnectionPool.java:129)
        at
oracle.ucp.jdbc.PoolDataSourceImpl.startPool(PoolDataSourceImpl.java:938)
        ... 58 more
Caused by: java.lang.IllegalArgumentException: empty service member name
        at oracle.ucp.common.ServiceMember.<init>(ServiceMember.java:163)
        at oracle.ucp.common.ServiceMember.<init>(ServiceMember.java:129)
        at oracle.ucp.common.Service$2.<init>(Service.java:790)
        at oracle.ucp.common.Service.create(Service.java:785)
        at oracle.ucp.common.Service.create(Service.java:588)
        at oracle.ucp.common.Topology.create(Topology.java:145)
        at oracle.ucp.common.Core$9.call(Core.java:1248)
        at oracle.ucp.common.Core$9.call(Core.java:1236)
        at oracle.ucp.common.Core.initialize(Core.java:1283)

With Thanks & Best Regards,
Chandra.