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老師，跑測試的時候報錯：Method com/mchange/v2/c3p0/impl/NewProxyPreparedStatement.isClosed()Z is abstract c3p由<groupId>c3p0</groupId>artifactId>c3p0</artifactId>
<version>0.9.1.2</version>換成oupId>com.mchange</groupId>
<artifactId>c3p0</artifactId><version>0.9.5.2</version>也不對

ZMS123

2018-05-28

源自：SpringBoot+MyBatis搭建迷你小程序 2-4

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翔仔回答被采納 +2 積分
2018-05-28

同學好，這得和你的Spring版本嚴格對應起來，否則isClosed這個方法沒有被實現，也就是c3p0版本不相符，你可以看看你的maven dependencies里的jar有沒有重復的c3p0.

下面是我的pom

<?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.imooc</groupId>	<artifactId>o2o</artifactId>	<version>0.0.1-SNAPSHOT</version>	<packaging>war</packaging>	<name>o2o</name>	<description>Demo?project?for?Spring?Boot</description>	<parent>		<groupId>org.springframework.boot</groupId>		<artifactId>spring-boot-starter-parent</artifactId>		<version>1.5.8.RELEASE</version>		<relativePath?/>?<!--?lookup?parent?from?repository?-->	</parent>	<properties>		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>		<java.version>1.8</java.version>	</properties>	<dependencies>		<!--?https://mvnrepository.com/artifact/ch.qos.logback/logback-classic?-->		<dependency>			<groupId>ch.qos.logback</groupId>			<artifactId>logback-classic</artifactId>		</dependency>		<!--?Servlet?web?-->		<dependency>			<groupId>javax.servlet</groupId>			<artifactId>javax.servlet-api</artifactId>		</dependency>		<!--?json解析?-->		<dependency>			<groupId>com.fasterxml.jackson.core</groupId>			<artifactId>jackson-databind</artifactId>		</dependency>		<!--?Map工具類?對標準java?Collection的擴展?spring-core.jar需commons-collections.jar?-->		<dependency>			<groupId>commons-collections</groupId>			<artifactId>commons-collections</artifactId>		</dependency>		<!--?數據庫?-->		<dependency>			<groupId>mysql</groupId>			<artifactId>mysql-connector-java</artifactId>		</dependency>		<!--?圖片處理?-->		<!--?https://mvnrepository.com/artifact/net.coobird/thumbnailator?-->		<dependency>			<groupId>net.coobird</groupId>			<artifactId>thumbnailator</artifactId>			<version>0.4.8</version>		</dependency>		<!--?https://mvnrepository.com/artifact/com.github.penggle/kaptcha?-->		<dependency>			<groupId>com.github.penggle</groupId>			<artifactId>kaptcha</artifactId>			<version>2.3.2</version>		</dependency>		<dependency>			<groupId>commons-fileupload</groupId>			<artifactId>commons-fileupload</artifactId>			<version>1.3.2</version>		</dependency>		<!--?redis客戶端:Jedis?-->		<dependency>			<groupId>redis.clients</groupId>			<artifactId>jedis</artifactId>		</dependency>		<dependency>			<groupId>org.mybatis.spring.boot</groupId>			<artifactId>mybatis-spring-boot-starter</artifactId>			<version>1.3.1</version>		</dependency>		<!--?二維碼相關?-->		<!--?https://mvnrepository.com/artifact/com.google.zxing/javase?-->		<dependency>			<groupId>com.google.zxing</groupId>			<artifactId>javase</artifactId>			<version>3.3.0</version>		</dependency>		<!--?https://mvnrepository.com/artifact/org.quartz-scheduler/quartz?-->		<dependency>			<groupId>org.quartz-scheduler</groupId>			<artifactId>quartz</artifactId>			<version>2.3.0</version>		</dependency>		<dependency>			<groupId>org.springframework</groupId>			<artifactId>spring-context-support</artifactId>		</dependency>		<dependency>			<groupId>org.springframework.boot</groupId>			<artifactId>spring-boot-starter-web</artifactId>		</dependency>		<dependency>			<groupId>org.springframework.boot</groupId>			<artifactId>spring-boot-starter-test</artifactId>			<scope>test</scope>		</dependency>		<!--?https://mvnrepository.com/artifact/com.alibaba/fastjson?-->		<dependency>			<groupId>com.alibaba</groupId>			<artifactId>fastjson</artifactId>			<version>1.2.45</version>		</dependency>		<!--?https://mvnrepository.com/artifact/com.squareup.okhttp3/okhttp?-->		<dependency>			<groupId>com.squareup.okhttp3</groupId>			<artifactId>okhttp</artifactId>			<version>3.9.1</version>		</dependency>	</dependencies>	<build>		<plugins>			<plugin>				<groupId>org.springframework.boot</groupId>				<artifactId>spring-boot-maven-plugin</artifactId>			</plugin>		</plugins>	</build></project>

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ZMS123 提問者

非常感謝！

2018-05-30 回復有任何疑惑可以回復我~

小熊熊HELLO
2018-06-02

我昨天也是這個問題，我一頓亂整，已解決。pom：

<dependencies>
? <dependency>
? ? ?<groupId>org.springframework.boot</groupId>
? ? ?<artifactId>spring-boot-starter-web</artifactId>
? </dependency>
? ? ? <dependency>
? ? ? ? ? <groupId>org.mybatis.spring.boot</groupId>
? ? ? ? ? <artifactId>mybatis-spring-boot-starter</artifactId>
? ? ? ? ? <version>1.3.1</version>
? ? ? </dependency>

? <dependency>
? ? ?<groupId>mysql</groupId>
? ? ?<artifactId>mysql-connector-java</artifactId>
? </dependency>

? <dependency>
? ? ?<groupId>org.springframework.boot</groupId>
? ? ?<artifactId>spring-boot-starter-test</artifactId>
? ? ?<scope>test</scope>
? </dependency>

? ? ? <dependency>
? ? ? ? ? <groupId>com.mchange</groupId>
? ? ? ? ? <artifactId>c3p0</artifactId>
? ? ? ? ? <version>0.9.5.2</version>
? ? ? </dependency>

? </dependencies>

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#1

ZMS123 提問者

咱倆一樣，我的也解決了

2018-06-02 回復有任何疑惑可以回復我~

#2

小熊熊HELLO 回復 ZMS123 提問者

???秒回

2018-06-02 回復有任何疑惑可以回復我~

慕九州5495211
2018-05-28

<dependencies>
???<dependency>
??????<groupId>org.springframework.boot</groupId>
??????<artifactId>spring-boot-starter-web</artifactId>
???</dependency>
???<dependency>
??????<groupId>org.mybatis.spring.boot</groupId>
??????<artifactId>mybatis-spring-boot-starter</artifactId>
??????<version>1.3.1</version>
???</dependency>

???<dependency>
??????<groupId>mysql</groupId>
??????<artifactId>mysql-connector-java</artifactId>
???</dependency>

???<dependency>
??????<groupId>com.mchange</groupId>
??????<artifactId>c3p0</artifactId>
??????<version>0.9.2.1</version>
???</dependency>

???<dependency>
??????<groupId>org.springframework.boot</groupId>
??????<artifactId>spring-boot-starter-test</artifactId>
??????<scope>test</scope>
???</dependency>

???<dependency>
??????<groupId>com.mchange</groupId>
??????<artifactId>mchange-commons-java</artifactId>
??????<version>0.2.3.4</version>
???</dependency>

</dependencies>

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慕九州5495211
2018-05-28

我解決了。在pom.xml中加入jar包，c3p0需要。。。
<dependency>
???<groupId>com.mchange</groupId>
???<artifactId>mchange-commons-java</artifactId>
???<version>0.2.3.4</version>
</dependency>

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#1

ZMS123 提問者

把你的pom貼一下唄？我的加了這個依賴還是報錯啊

2018-05-28 回復有任何疑惑可以回復我~