jiang2015 edited a comment on issue #7761:
URL: https://github.com/apache/shardingsphere/issues/7761#issuecomment-712738297
sorry, I have no idea how to add the TestCase for this issue;
In 【MetaDataConnectionAdapterTest】 I add one function as follows：
```
private final DatabaseType **databaseType4Oracle** =
DatabaseTypes.getTrunkDatabaseType("Oracle");
@Test
public void assertGetSchema4Oracle() throws SQLException {
when(connection.getSchema()).thenReturn(TEST_SCHEMA);
MetaDataConnectionAdapter connectionAdapter = new
MetaDataConnectionAdapter(**databaseType4Oracle**, connection);
assertThat(connectionAdapter.getSchema(), is(TEST_SCHEMA));
}
```
when test, NullPointerException occured as follow
java.lang.NullPointerException
at
org.apache.shardingsphere.infra.metadata.model.physical.jdbc.handler.impl.OracleJDBCSchemaHandler.getSchema(OracleJDBCSchemaHandler.java:46)
at
org.apache.shardingsphere.infra.metadata.model.physical.jdbc.MetaDataConnectionAdapter.getSchema(MetaDataConnectionAdapter.java:79)
at
org.apache.shardingsphere.infra.metadata.model.physical.jdbc.MetaDataConnectionAdapterTest.assertGetSchema4Oracle(MetaDataConnectionAdapterTest.java:78)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at
org.mockito.internal.runners.DefaultInternalRunner$1.run(DefaultInternalRunner.java:68)
at
org.mockito.internal.runners.DefaultInternalRunner.run(DefaultInternalRunner.java:74)
at org.mockito.internal.runners.StrictRunner.run(StrictRunner.java:39)
at org.mockito.junit.MockitoJUnitRunner.run(MockitoJUnitRunner.java:161)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at
com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at
com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
at
com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)
the reason:
OracleJDBCSchemaHandler
```
public String getSchema(final Connection connection) {
try {
return
Optional.ofNullable(connection.getMetaData().getUserName()).map(String::toUpperCase).orElse(null);
} catch (final SQLException ignored) {
return null;
}
}
```
connection.getMetaData() is null, this issue how to add testcase ,please
give me advice ，thanks。
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