Hi there,
I have created a Web project using Eclipse 3.4. However, it can't resolve
the class reference to the current directory.
Here is the project layout and description of the problem:
>DBTest
>src
> command
CommandExecutor.java
...
...
DatabaseCommand.java
...
Double-clicks on the file CommandExecutor.java, it display the following
content:
package command;
import java.sql.Connection;
import java.sql.SQLException;
import javax.sql.DataSource;
import javax.naming.InitialContext;
import javax.naming.Context;
import javax.naming.NamingException;
/**
* Gets and caches data sources, gets connections
* Implements Singleton pattern
*/
public class CommandExecutor {
private static CommandExecutor myOnlyInstance = null;
private DataSource ds = null;
// accessor method for the singleton
public static CommandExecutor getInstance() throws NamingException {
if (myOnlyInstance == null) {
myOnlyInstance = new CommandExecutor();
}
return myOnlyInstance;
}
// Constructor for the singleton
private CommandExecutor() throws NamingException {
getDataSource();
}
// get the data source from initial context
public DataSource getDataSource() throws NamingException {
if (ds == null) {
InitialContext ctx = new InitialContext();
Context envCtx = (Context)
ctx.lookup("java:comp/env");
ds = (DataSource) envCtx.lookup("jdbc/TestDB");
}
return ds;
}
// get the SQL connection from the database
public Connection getConnection() throws NamingException,
SQLException {
return getDataSource().getConnection();
}
// execute particular database command
public Object executeDatabaseCommand(DatabaseCommand c) throws
Exception {
Connection conn = null;
try {
conn = getConnection();
Object o = c.executeDatabaseOperation(conn);
return o;
} catch (SQLException e) {
throw e;
} catch (NamingException ne) {
throw ne;
} finally {
if (conn != null) conn.close();
}
}
}
The DatabaseCommand has error. Move the cursor onto the name of
DatabaseCommand, an error message popup:
DatabaseCommand cannot be resolved as a type
3 quick fixes available:
. Add type parameter "DatabaseCommand" to "CommandExecutor"
. Add type parameter "DatabaseCommand" to
"executeDatabaseCommand(DatabaseCommand)"
. Fix Project Setup...
I think I need to choose the third option "Fix Project Setup".
Now, from Java Build Path, under the Source menu tab, it has the the
following layout:
DBTest/src
Included: (All)
Excluded: (None)
Native librarylocation (None)
Look back the very beginning of this post, you can see the class file
DatabaseCommand.java file is already defined in the same directory as as
CommandExecutor.java defined.
How to tell Eclipse compiler that the DatabaseCommand class is in the same
directory as the CommandExecutor.java?
Thanks
Sam
