我正在尝试学习OSGi,我做了一个简单的项目,它将在Sqlite DB中创建一个表。我在构建路径中添加了"sqlite-jdbc-3.7.2.jar"。但当我运行该项目时,它显示"ClassNotFoundException"。
我将Eclipse IDE与BndTools一起使用。
我搜索了其他帖子,有些人说把jar作为一个不同的捆绑包添加,然后导出。我尝试了一下。在工作区中,我选择了导入->插件和碎片->选择目录。但它没有列出Jar(适用于其他Jar,但没有检测到sqlite-jdbc-3.7.2.Jar)
,我已经做了如下操作
se.sample.sqlitedbconn.ConnActivator.java
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import se.sample.connproperties.CreateTable;
import aQute.bnd.annotation.component.*;
@Component
public class ConnActivator implements BundleActivator {
Connection connection;
Statement statement;
@Activate
public void start(BundleContext context) throws Exception {
System.out.println("Starting");
try {
Class.forName("org.sqlite.JDBC");
connection = DriverManager.getConnection("jdbc:sqlite://home/raj/Desktop/EclipseProjectsWorkspace/ZWave.db");
} catch (Exception ex) {
System.err.println(ex.getClass().getName()+": "+ex.getMessage());
}
System.out.println("Connection To Database Successful");
CreateTable createTable = new CreateTable();
statement = connection.createStatement();
boolean isTableCreated = createTable.createANewTable(connection,statement);
if(isTableCreated){
System.out.println("Table Created Successfully!");
}else{
System.out.println("Table Creation Failed!");
}
statement.close();
}
@Deactivate
public void stop(BundleContext context) throws Exception {
System.out.println("Stopping");
if(connection != null){
connection.close();
}
System.out.println("Database Connection Closed!");
}
}
se.sample.conproperties.CreateTable.java
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;
public class CreateTable {
public boolean createANewTable(Connection connection, Statement statement) {
String sql = "CREATE TABLE Product " +
"(ProductId INT PRIMARY KEY NOT NULL,"+
"ProductName TEXT NOT NULL,"+
"ProductPrice REAL);";
try {
statement.executeUpdate(sql);
} catch (SQLException e) {
System.err.println(e.getClass().getName()+": "+e.getMessage());
return false;
}
return true;
}
}
当我运行这个时,我得到以下错误:
Starting
Connection To Database Successful
java.lang.ClassNotFoundException: org.sqlite.JDBC not found by se.sample.sqlitedbconn [8]
! Failed to start bundle se.sample.sqlitedbconn-0.0.0.201503241305, exception activator error null from: se.sample.sqlitedbconn.ConnActivator:start#34
____________________________
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g!
请帮助我:)
请看一下这里的一个很棒的OSGi教程,它很好地描述了数据库连接和OSGi。
向致以最良好的问候
SQLite JDBC的3.8.11.2版本现在是一个OSGI捆绑包,所以如果您将SQLite JDBC jar部署为OSGI捆绑而不是捆绑包的嵌入式jar,它应该可以工作。