java.sql.SQLRecoverableException: IO Error: The Network Adapter could not establish the connection

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IO Error: Invalid connection string format, a valid format is: "//host[:port][/service_name]"
java.sql.SQLRecoverableException: IO Error: The Network Adapter could not establish the connection
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:489)
at oracle.jdbc.driver.PhysicalConnection.(PhysicalConnection.java:678)
at oracle.jdbc.driver.T4CConnection.(T4CConnection.java:234)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:34)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:567)
at weblogic.jdbc.common.internal.ConnectionEnvFactory.makeConnection(ConnectionEnvFactory.java:359)
at weblogic.jdbc.common.internal.ConnectionEnvFactory.createResource(ConnectionEnvFactory.java:241)
at weblogic.common.resourcepool.ResourcePoolImpl.makeResources(ResourcePoolImpl.java:1322)
at weblogic.common.resourcepool.ResourcePoolImpl.makeResources(ResourcePoolImpl.java:1239)
at weblogic.common.resourcepool.ResourcePoolImpl.reserveResourceInternal(ResourcePoolImpl.java:463)
at weblogic.common.resourcepool.ResourcePoolImpl.reserveResource(ResourcePoolImpl.java:352)
at weblogic.jdbc.common.internal.ConnectionPool.reserve(ConnectionPool.java:471)
at weblogic.jdbc.common.internal.ConnectionPool.reserve(ConnectionPool.java:368)
at weblogic.jdbc.common.internal.ConnectionPool.reserve(ConnectionPool.java:353)
at weblogic.jdbc.common.internal.DataSourceRuntimeMBeanImpl.lookupMetaData(DataSourceRuntimeMBeanImpl.java:740)
at weblogic.jdbc.common.internal.DataSourceRuntimeMBeanImpl.getMetaData(DataSourceRuntimeMBeanImpl.java:762)
at weblogic.jdbc.common.internal.DataSourceRuntimeMBeanImpl.getDriverName(DataSourceRuntimeMBeanImpl.java:794)
at sun.reflect.GeneratedMethodAccessor476.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at weblogic.management.jmx.modelmbean.WLSModelMBean.getAttribute(WLSModelMBean.java:525)

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