c3p0连接池出现问题

//抽取类
package com.immoc.utils;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class Source2 {
	
	private static ComboPooledDataSource dataSource = new ComboPooledDataSource();
	/**
	 * 连接数据库
	 */
	public static Connection getConnection() throws Exception {
		Connection conn = dataSource.getConnection();
		return conn;
	}
	
	
	/**
	 * 关闭资源代码抽取
	 */
	public static void sourceClose(Statement stmt,Connection conn) {
		if(stmt != null) {
			try {
				stmt.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			stmt = null;//垃圾回收机制可以进行垃圾回收
		}
		
		if(conn != null) {
			try {
				conn.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			conn = null;
		}
	}
	
	/**
	 * 关闭资源代码抽取
	 */
	public static void sourceClose(Statement stmt,Connection conn,ResultSet rs) {
		if(stmt != null) {
			try {
				stmt.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			stmt = null;//垃圾回收机制可以进行垃圾回收
		}
		
		if(conn != null) {
			try {
				conn.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			conn = null;
		}
		
		if(rs != null) {
			try {
				rs.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			rs = null;
		}
	}
}

//测试类

package com.immoc.jdbc.demo1;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import org.junit.jupiter.api.Test;

import com.immoc.utils.Source2;

class JDBCDemo4 {

/**

* c3p0连接池测试

@Test

void test() {

Connection conn = null;

PreparedStatement pstmt = null;

ResultSet rs = null;

try {

//1.获得连接

conn = Source2.getConnection();

//2.SQL语句预处理对象

String sql = "select * from goods";

pstmt =conn.prepareStatement(sql);

rs = pstmt.executeQuery();

while(rs.next()) {

System.out.println(rs.getInt("id")+" "+rs.getString("name")+" "+rs.getFloat("price")+" "+rs.getString("desp"));

}

}catch(Exception e) {

e.printStackTrace();

}finally {

Source2.sourceClose(pstmt, conn, rs);

}

//报错信息

java.lang.NoClassDefFoundError: Could not initialize class com.immoc.utils.Source2

at com.immoc.jdbc.demo1.JDBCDemo4.test(JDBCDemo4.java:33)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:389)

at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:115)

at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:167)

at org.junit.jupiter.engine.execution.ThrowableCollector.execute(ThrowableCollector.java:40)

at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:163)

at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:110)

at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:57)

at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:83)

at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)

at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)

at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$null$2(HierarchicalTestExecutor.java:92)

at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(Unknown Source)

at java.util.stream.ReferencePipeline$2$1.accept(Unknown Source)

at java.util.Iterator.forEachRemaining(Unknown Source)

at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Unknown Source)

at java.util.stream.AbstractPipeline.copyInto(Unknown Source)

at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)

at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(Unknown Source)

at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(Unknown Source)

at java.util.stream.AbstractPipeline.evaluate(Unknown Source)

at java.util.stream.ReferencePipeline.forEach(Unknown Source)

at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:92)