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Those are 'properties' and would be set on the command-line but you can set them in code before you begin referencing JDBC.

They are generally only (and then only rarely) used in an application server context.

See the Application Server Performance Guide

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6.3.7 Setting the OC4J JDBC DMS Statement Metrics Option
To improve performance, by default OC4J does not collect JDBC statement metrics. The properties, oracle.jdbc.DMSStatementCachingMetrics and oracle.jdbc.DMSStatementMetrics are by default, set to false. When these properties are false, performance is improved since OC4J does not collect expensive JDBC statement level metrics.

Setting these properties to true may have a negative impact on performance. You should only set these properties to true when you need to collect JDBC statement metrics.

When oracle.jdbc.DMSStatementCachingMetrics property is set to true and JDBC statement caching is enabled, the JDBC statement metrics are available.

When JDBC statement caching is disabled, make the JDBC statement metrics available by setting the property oracle.jdbc.DMSStatementMetrics to true.

I set both oracle.jdbc.DMSStatementCachingMetrics and oracle.jdbc.DMSStatementMetrics to true, but still do not see the SQLText value in DMS Spy.

So I want to try another way, "If the 11.1 version of the DMS JAR file is present in the classpath environment variable, then JDBC checks the DMS update SQL text flag. If this flag is true, then the SQLText metric is updated." The problem is it does not mention what's the name of this "DMS update SQL text flag", or how to set it.

This question has NOTHING to do with JDBC. As previously stated DMS is used ONLY within an application server context.

You should mark this question ANSWERED and repost it in the Fusion Middleware forum.
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DMS is used in Oracle Application Server and WebLogic Server. You shouldn't be using it except in those environments.