Paul Rogers commented on DRILL-5090:

Further tests show that the {{StoragePluginRegistryImpl.createPlugins()}} 
method does not load the test bootstrap plugins because the local plugin 
directory already exists: {{/tmp/drill/sys.storage_plugins}}.

Not sure how this could have ever worked if this directory exists and has 

cp.sys.drill    dfs.sys.drill   s3.sys.drill

These may have been created when running other unit tests. How are they being 
cleaned up for folks for whom the JDBC unit tests succeed?

> JDBC tests silently ignore failure to set up test storage plugin
> ----------------------------------------------------------------
>                 Key: DRILL-5090
>                 URL: https://issues.apache.org/jira/browse/DRILL-5090
>             Project: Apache Drill
>          Issue Type: Bug
>    Affects Versions: 1.8.0
>            Reporter: Paul Rogers
> Run the {{TestJDBCQuery}} test cases using Java 8. The tests will fail with 
> error such as:
> {code}
> Current default schema: No default schema selected
> {code}
> The problem is that the tests try to set up a test schema, but fail. The code 
> that does this setup just silently ignores the error:
> {code}
>     try {
>         TestUtilities.updateDfsTestTmpSchemaLocation(pluginRegistry, 
> tmpDirPath);
>         TestUtilities.makeDfsTmpSchemaImmutable(pluginRegistry);
>       }
>     } catch(Throwable e) {
>       // ... This is unlikely to
>       // happen, but just a safeguard to avoid failing user applications.
>       logger.warn("Failed to update tmp schema locations. This step is purely 
> for testing purpose. " +
>           "Shouldn't be seen in production code.");
>       // Ignore the error and go with defaults
>     }
> {code}
> The reason that the error is ignored is that the JDBC driver _itself_ 
> contains test code in the form of the following check:
> {code}
>       if (props != null && 
> "true".equalsIgnoreCase(props.getProperty("drillJDBCUnitTests"))) {
> {code}
> That is, the JDBC driver itself contains the code needed to set up the test 
> schemas. This means that test code is shipped in production. And, we must 
> handle the failure gracefully in case the user set the property in production.
> Requested changes:
> * Find a way to do test setup without including test code in JDBC.
> * If test setup fails, issue a fatal error to direct the developer to the 
> actual problem.
> And, of course, fix the Java 8 error so that the tests pass. Fixing that 
> error is a separate issue. If things were to fail again, we need the above 
> fixes to avoid wasting developer's time finding the problem.

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