我创建了一个maven java应用程序来执行一些neo4j查询。我有一个neo4j查询正在执行的类，还有一个我用Swing制作gui的类，所以我可以使用一个按钮来执行查询并在textArea中显示结果。如果我在Netbeans中运行项目，但是当我使用maven shade插件创建这个项目的胖罐时，一切正常，有些事情发生，neo4j命令不起作用。我认为问题出在lucene jars（来自apache文件夹和neo4j文件夹）所以我在pom.xml文件中使用了一些代码来修复它，没有运气。也许问题是因为类路径中的类名冲突。
myJFrame.java
package com.mycompany.neo4jqueries;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.Date;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingWorker;
/**
*
* @author Dar309
*/
public class myJFrame extends JPanel {
private JComboBox firstComboBox;
private JTextArea queryTextArea, resultTextArea, infoTextArea;
private String[] comboBoxItems, queryList;
private JButton executeButton;
private Font monosSpacedFont = new Font("monospaced", Font.PLAIN, 12);
private JProgressBar progressBar;
private Task myTask;
private long miliBeforeExec = 0, miliAfterExec = 0, execTime = 0;
public myJFrame() {
super(new BorderLayout());
JPanel firstPanel = new JPanel();
BorderLayout fpL = new BorderLayout();
firstPanel.setLayout(fpL);
JPanel topPanel = new JPanel();
topPanel.setLayout(new BorderLayout());
JPanel topPanel1 = new JPanel();
topPanel1.setLayout(new FlowLayout(FlowLayout.CENTER));
comboBoxItems = new String[]{"1",
"The Top 10 Stack Overflow Users",
"The Top 5 tags That Jon Skeet Used in Asking Questions"};
queryList = new String[]{"match (n) \nreturn head(labels(n)) as label, count(*)",
"match (u:User) \nwith u,size( (u)-[:POSTED]->()) as posts order by posts desc limit 10 \nreturn u.name, posts",
"match (u:User)-[:POSTED]->()-[:HAS_TAG]->(t:Tag) \nwhere u.name = 'Jon Skeet' \nreturn t,count(*) as posts order by posts desc limit 5"};
firstComboBox = new JComboBox(comboBoxItems);
firstComboBox.setSelectedIndex(0);
firstComboBox.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
queryTextArea.setText(queryList[firstComboBox.getSelectedIndex()]);
}
});
topPanel1.add(firstComboBox);
JPanel topPanel2 = new JPanel();
topPanel2.setLayout(new FlowLayout());
queryTextArea = new JTextArea();
queryTextArea.setText(queryList[0]);
queryTextArea.setFont(monosSpacedFont);
queryTextArea.setEditable(false);
JScrollPane queryScrollPane = new JScrollPane(queryTextArea);
queryScrollPane.setPreferredSize(new Dimension(450, 110));
topPanel2.add(queryScrollPane);
JPanel topPanel3 = new JPanel();
topPanel3.setLayout(new FlowLayout());
progressBar = new JProgressBar(0, 100);
progressBar.setValue(0);
progressBar.setString("No progress yet");
progressBar.setStringPainted(true);
executeButton = new JButton("Execute");
executeButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
executeButton.setEnabled(false);
progressBar.setIndeterminate(true);
firstComboBox.setEnabled(false);
progressBar.setString("Loading...");
setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
miliBeforeExec = System.currentTimeMillis();
//Instances of javax.swing.SwingWorker are not reusuable, so
//we create new instances as needed.
myTask = new Task();
myTask.addPropertyChangeListener(new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
if ("progress" == evt.getPropertyName()) {
// int progress = (Integer) evt.getNewValue();
// progressBar.setValue(progress);
}
}
});
myTask.execute();
}
});
topPanel3.add(progressBar);
topPanel3.add(executeButton);
topPanel.add(topPanel1, BorderLayout.NORTH);
topPanel.add(topPanel2, BorderLayout.CENTER);
topPanel.add(topPanel3, BorderLayout.SOUTH);
firstPanel.add(topPanel, BorderLayout.NORTH);
JPanel resultPanel = new JPanel();
resultPanel.setLayout(new BorderLayout());
resultTextArea = new JTextArea();
resultTextArea.setFont(monosSpacedFont);
resultTextArea.setText("");
resultTextArea.setEditable(false);
JScrollPane centerScrollPane = new JScrollPane(resultTextArea);
centerScrollPane.setPreferredSize(new Dimension(550, 200));
centerScrollPane.setBorder(BorderFactory.createEmptyBorder(5, 0, 10, 0));
resultPanel.add(centerScrollPane, BorderLayout.CENTER);
infoTextArea = new JTextArea();
infoTextArea.setRows(2);
infoTextArea.setFont(monosSpacedFont);
infoTextArea.setEditable(false);
resultPanel.add(infoTextArea, BorderLayout.SOUTH);
firstPanel.add(resultPanel, BorderLayout.CENTER);
add(firstPanel, BorderLayout.CENTER);
setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
}
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame();
// frame.setSize(650, 550);
frame.setSize(Toolkit.getDefaultToolkit().getScreenSize().width / 2,Toolkit.getDefaultToolkit().getScreenSize().height / 2);
frame.setMinimumSize(new Dimension(frame.getWidth(), frame.getHeight()));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setTitle("Execute your Neo4j queries");
Dimension dimension = Toolkit.getDefaultToolkit().getScreenSize();
int x = (int) ((dimension.getWidth() - frame.getWidth()) / 2);
int y = (int) ((dimension.getHeight() - frame.getHeight()) / 2);
frame.setLocation(x, y);
//Create and set up the content pane.
JComponent newContentPane = new myJFrame();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
}
class Task extends SwingWorker<Void, Void> {
/*
* Main task. Executed in background thread.
*/
@Override
public Void doInBackground() {
// Random random = new Random();
// int progress = 0;
//Initialize progress property.
setProgress(0);
System.out.println("popo");
resultTextArea.append("popo");
myQuery mq = new myQuery();
mq.run(myJFrame.this);
resultTextArea.append("metaaaa");
System.out.println("metaaa");
// setProgress(Math.min(progress, 100));
return null;
}
/*
* Executed in event dispatching thread
*/
@Override
public void done() {
Toolkit.getDefaultToolkit().beep();
progressBar.setIndeterminate(false);
executeButton.setEnabled(true);
firstComboBox.setEnabled(true);
// resultTextArea.setCaretPosition(resultTextArea.getText().length());
setCursor(null); //turn off the wait cursor
miliAfterExec = System.currentTimeMillis();
execTime = miliAfterExec - miliBeforeExec;
// execTime += 11140000;
if (execTime < 60 * 1000) {
infoTextArea.setText("Total time: " + (double) (execTime / 1000.000) + "s");
}
// else if(execTime >= (60 * 1000) && execTime < (3600 * 1000) ){
else if (execTime >= (60 * 1000)) {
long temp = execTime;
for (long i = 0; i < execTime / (60 * 1000); i++) {
temp -= (60 * 1000);
}
infoTextArea.setText("Total time: " + (execTime / (60 * 1000)) + ":" + (double) (temp / 1000.000) + "s");
}
Date date = new Date();
infoTextArea.append("\nFinished at: " + date.toString());
progressBar.setString("Done!");
}
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
createAndShowGUI();
}
});
}
public JTextArea getResultTextArea() {
return resultTextArea;
}
public JTextArea getQueryTextArea() {
return queryTextArea;
}
}
myQuery.java
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package com.mycompany.neo4jqueries;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import javax.swing.JFrame;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Result;
import org.neo4j.graphdb.Transaction;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;
import org.neo4j.helpers.collection.Iterators;
/**
*
* @author Dar309
*/
public class myQuery {
private static final File DB_PATH = new File("D:/IU/Διπλωματική/neo4j-community-3.1.2/data/databases/graph.db");
String resultString;
String columnsString;
String nodeResult;
String rows = "";
void run(myJFrame myFrame) {
GraphDatabaseService db = new GraphDatabaseFactory().newEmbeddedDatabase(DB_PATH);
myFrame.getResultTextArea().append("sdadsdsadsads");
System.out.println("naiiiii");
try (Transaction ignored = db.beginTx();
// Result result = db.execute("match (u:User) with u,size( (u)-[:POSTED]->()) as posts order by posts desc limit 10 return u.name, posts")) {
Result result = db.execute(myFrame.getQueryTextArea().getText() ) ) {
// START SNIPPET: columns
List<String> columns = result.columns();
// END SNIPPET: columns
columnsString = columns.toString();
// resultString = db.execute( "match (u:User) with u,size( (u)-[:POSTED]->()) as posts order by posts desc limit 10 return u.name, posts" ).resultAsString();
resultString = result.resultAsString();
System.out.println("\n\ncolumnsString\n------------------------------------------");
System.out.println(columnsString);
System.out.println("\n\nresultString\n------------------------------------------");
System.out.println(resultString);
myFrame.getResultTextArea().append(resultString);
try {
PrintWriter writer = new PrintWriter("the-file-name.txt", "UTF-8");
writer.print(resultString);
writer.close();
} catch (IOException e) {
// do something
}
}
db.shutdown();
}
}
的pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.mycompany</groupId>
<artifactId>Neo4jQueries</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j</artifactId>
<version>3.1.2</version>
</dependency>
</dependencies>
<name>neo4jQueries</name>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.0.0</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<shadedArtifactAttached>true</shadedArtifactAttached>
<shadedClassifierName>shaded</shadedClassifierName>
<createDependencyReducedPom>false</createDependencyReducedPom>
<relocations>
<relocation>
<pattern>org.apache.lucene</pattern>
<shadedPattern>shaded_lucene_5_5_0.org.apache.lucene</shadedPattern>
</relocation>
<relocation>
<pattern>org.neo4j</pattern>
<shadedPattern>shaded_neo4j.org.neo4j</shadedPattern>
</relocation>
</relocations>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>com.mycompany.neo4jqueries.myJFrame</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>neo4j-repo</id>
<name>Neo4j Repository</name>
<url>http://m2.neo4j.org/content/repositories/releases</url>
</repository>
</repositories>
</project>
当我双击jar时，我看到gui并且一切正常，直到调用myQuery类，然后没有执行neo4j命令但没有显示错误消息。
有人可以帮我解决这个问题吗？
答案 0 :(得分：0)
您的程序硬编码neo4j DB的路径。
因此，如果您没有在开发代码的同一台机器上运行jar文件，它将无法找到数据库并将抛出异常。
但是，正如InvokeLater的文档所说，如果Runnable传递给它：
抛出一个未捕获的异常事件调度线程将展开 （不是当前的主题）
这意味着您的线程永远不会看到任何未捕获的异常，除非您明确告诉Swing使用您提供的异常处理程序。请参阅this question及其2个得分最高的答案，了解如何执行此操作（取决于您使用的Java版本）。