False Negative : CloseSql.ql cannot detect bugs in the Try-Catch block.
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Beschreibung
**Version**
codeql 2.23.9
**Description of the issue**
When I used java/Likely Bugs/Resource Leaks/CloseSql.ql to check the following code, it correctly reported an issue of improper use of createStatement.
```java
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
public class PosCase3 {
public void test() throws SQLException {
// Scenario 3: Primary resource assigned
Connection conn = DriverManager.getConnection("url", "user", "pass");
// Secondary created from primary, not assigned, not closed
conn.createStatement(); // [REPORTED LINE]
// Secondary Statement leak -> Positive detection.
}
}
```
However, when using CloseSql.ql to detect the following code, no bug were detected and no bug were reported.
```java
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.function.Supplier;
public class PosCase3_Var3 {
public void test() throws SQLException {
// Variant 3: Use Supplier to defer creation, then discard
Connection conn = DriverManager.getConnection("url", "user", "pass");
Supplier supplier = () -> {
try {
return conn.createStatement();
} catch (SQLException e) {
throw new RuntimeException(e);
}
};
supplier.get(); // Statement created and leaked
}
}
```
Beitragsleitfaden
Rechercherichtung
Start by reading the Java resource-leak query in CloseSql.ql and compare its handling of the direct createStatement case with the Supplier example's try-catch block. Done means the query reports the discarded Statement created by supplier.get() while preserving the existing detection.
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