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GeneralCore

•Created by GeneralCore on 1/9/2025 in #java-help

"Java Virtual Machine Launcher -A Java Exception has occured" error in Maven .jar file

When I use "java -jar [file name].jar" using cmd it works, but doucle cliking the .jar file give me an error. I use maven assembly plugin, and netbeans > build with dependencies

            <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <version>3.7.1</version>
                <configuration>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                    <archive>
                        <manifest>
                            <mainClass>com.mycompany.ytdlp.Main</mainClass>
                        </manifest>
                    </archive>
                </configuration>
                <executions>
                    <execution>
                        <id>make-assembly</id>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

            <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <version>3.7.1</version>
                <configuration>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                    <archive>
                        <manifest>
                            <mainClass>com.mycompany.ytdlp.Main</mainClass>
                        </manifest>
                    </archive>
                </configuration>
                <executions>
                    <execution>
                        <id>make-assembly</id>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

11 replies

JCHJava Community | Help. Code. Learn.

•Created by GeneralCore on 7/2/2024 in #java-help

Operation not allowed for a result set of type ResultSet.TYPE_FORWARD_ONLY.

public reading() {
        ResultSet rs;
        try {
            Statement st;
            String sql = "SELECT * from utility";
            st = con.createStatement();
            rs = st.executeQuery(sql);

            rs.last();
            System.out.println(rs.getInt("reading"));

        } catch (Exception e) {
            System.err.println(e);
        }
    }

public reading() {
        ResultSet rs;
        try {
            Statement st;
            String sql = "SELECT * from utility";
            st = con.createStatement();
            rs = st.executeQuery(sql);

            rs.last();
            System.out.println(rs.getInt("reading"));

        } catch (Exception e) {
            System.err.println(e);
        }
    }

rs.last() is the cause of the problem. I have no problem when I use

rs.next()

rs.next()

. But the thing is, I only need to retrieve the last row of the reading column instead of retrieving everything. I also tried putting

rs.last()

rs.last()

if-else

if-else

5 replies

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