小编Ser*_*X44的帖子

我正在构建一个带有嵌入式Jetty和Handlebars模板引擎的Spark框架的Java应用程序.但是当我得到500内部错误时,控制台没有说什么.我已经在我的pom.xml中添加了依赖项:http://sparkjava.com/documentation.html#add-a-logger 但不会打印所有异常/错误(如错误500)

在这里我的pom.xml dependecies

<dependencies>

    <!-- FRAMEWORK:     Spark -->
    <dependency>
        <groupId>com.sparkjava</groupId>
        <artifactId>spark-core</artifactId>
        <version>2.5</version>
    </dependency>

    <!-- TEMPLATES:     Handlebars -->
    <dependency>
        <groupId>com.sparkjava</groupId>
        <artifactId>spark-template-handlebars</artifactId>
        <version>2.3</version>
    </dependency>

    <!-- DB-MAPPING:    sql2o -->
    <dependency>
        <groupId>org.sql2o</groupId>
        <artifactId>sql2o</artifactId>
        <version>1.5.4</version>
    </dependency>

    <!-- DRIVERS: sqlite-->
    <dependency>
        <groupId>org.xerial</groupId>
        <artifactId>sqlite-jdbc</artifactId>
        <version>3.8.11.2</version>
    </dependency>

    <!-- LOGGER:        slf4j -->
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-simple</artifactId>
        <version>1.7.21</version>
    </dependency>

</dependencies>

我怎样才能启用所有火花记录？

我在向 xml 文件添加元素时遇到一些问题

我有一个具有以下结构的 xml：

<Root>
    <Item>
        <ItemId>first</ItemId>
        <Datas>
            <Data>one</Data>
            <Data>two</Data>
            <Data>three</Data>
        </Datas>
    </Item>
    <Item>
        <ItemId>second</ItemId>
        <Datas>
            <Data>one</Data>
            <Data>two</Data>
            <Data>three</Data>
        </Datas>
    </Item>
</Root>

我只想在 itemid 为第二时添加数据，并获得如下输出：

<Root>
    <Item>
        <ItemId>first</ItemId>
        <Datas>
            <Data>one</Data>
            <Data>two</Data>
            <Data>three</Data>
        </Datas>
    </Item>
    <Item>
        <ItemId>second</ItemId>
        <Datas>
            <Data>one</Data>
            <Data>two</Data>
            <Data>three</Data>
            <Data>FOUR</Data>
            <Data>FIVE</Data>
        </Datas>
    </Item>
</Root>

感谢您的帮助！

该程序大多数工作正常,但不打开任何窗口.它应该在桌面右下方显示一个小对话框.但是对于另一个人来说,编译相同的代码没有问题.我们有相同的Java运行时(1.8_u40).我怎样才能解决这个问题？

我把代码放在下面:

import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.RoundRectangle2D;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JProgressBar;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class ProgressDialog {
    private JDialog dialogFrame;
    private JProgressBar progressBar;
    private JLabel headingLabel;
    private Uploader callerUploader;

    public ProgressDialog() {

        dialogFrame = new JDialog();
        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException
                | UnsupportedLookAndFeelException ex) {
            System.err.println(ex.toString());
        }

        dialogFrame.setSize(200, 50);
        dialogFrame.setLayout(new GridBagLayout());

        GridBagConstraints constraints = new GridBagConstraints(); …

我想让标签出现和消失，但我遇到了grid_forget(). 这是代码的一部分：

def creabackuno():
    showinfo( "Wait..","I am creating the backup, please wait...")
    vsl=Label(gui,text="Working, please wait...",font=("arial",16)).grid(row=20,rowspan=1,column=0,columnspan=1,padx=10,sticky=N)
    try:
        copytree(path,r"backup\dirbackup1\.minecraft")
        showinfo( "OK!","Backup (1) created!")
        vsl.grid_forget()
    except OSError:
        showerror( "Nope!","There is already a backup to restore")
        vsl.grid_forget()

这是控制台的错误：

AttributeError: 'NoneType' object has no attribute 'grid_forget'