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Editorial Team
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Asked: 2026-06-01T22:02:59+00:00

I wrote a small java program in Netbeans. It compiles and runs perfectly. But

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I wrote a small java program in Netbeans. It compiles and runs perfectly. But I also need to compile it in javac in Linux because this homework is tested there. Whenever I attempt, I get the following compile error message. Do you have any idea about this message?

/usr/lib64/gcc/x86_64-suse-linux/4.6/../../../../lib64/crt1.o: In function `_start':
/home/abuild/rpmbuild/BUILD/glibc-2.14.1/csu/../sysdeps/x86_64/elf/start.S:109: undefined reference to `main'

I just write the following line for import a library 

 import java.sql.*;

I am just using println except sql operations. The beginning of my code is below:

Connection conn = null;
try{
    String username = ".....";
    String password = "....";
    String url = "jdbc:mysql://localhost:3306/.....";
    Class.forName("com.mysql.jdbc.Driver").newInstance();
    conn = DriverManager.getConnection(url, username, password);
    System.out.println("Database connection extablished.");
}
catch(Exception e){
    System.out.println("Cannot connect to database server");
}

After this part of code, nothing special, just ordinary lines.

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1 Answer

  1. Editorial Team

    It seems that error may be because you’re not defining a main method, and the compiler therefore can’t find it.

    However, I have to ask why you’re using GCC? Normal JDK is available on Linux and should be your preferred choice unless you have a very good reason otherwise! If Netbeans isn’t compiling your application on Linux then it’s probably because you haven’t set something up properly or installed the JDK – you can (and should) use the JDK rather than GCJ, which is now largely unmaintained.

    You can either grab it through your package manager or download it separately here.

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