spring - JPA Hibernate 通信 リンク障害エラー

Question

私はJPAとHibernateに本当の問題を抱えています.通信リンクの障害が発生することがあります.なぜそれが頻繁に発生するのかわかりません.なぜそれが環境の問題なのかわかりません.構成の問題が本当に頭に浮かびません.問題を解決し、うまくいけば正しい方向に向けてくれます

ここにスタックトレースがあります

 21:41:34,726 DEBUG SqlExceptionHelper:139 - Communications link failure
 2013-02-21T21:41:34+00:00 app[web.1]: 
 2013-02-21T21:41:34+00:00 app[web.1]: The last packet successfully received from the  server was 79,581 milliseconds ago.  The last packet sent successfully to the server was 0 milliseconds ago. [n/a]
 2013-02-21T21:41:34+00:00 app[web.1]: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
  2013-02-21T21:41:34+00:00 app[web.1]: 
 2013-02-21T21:41:34+00:00 app[web.1]: The last packet successfully received from the server was 79,581 milliseconds ago.  The last packet sent successfully to the server was 0 milliseconds ago.
 2013-02-21T21:41:34+00:00 app[web.1]:  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

POM.xml

<properties>
  <org.springframework.version>3.1.1.RELEASE</org.springframework.version>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

<dependencies>
  <dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.0.1</version>
    <scope>provided</scope>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>${org.springframework.version}</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-orm</artifactId>
    <version>${org.springframework.version}</version>
</dependency>
<dependency>
    <groupId>taglibs</groupId>
    <artifactId>standard</artifactId>
    <version>1.1.2</version>
</dependency>
<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>jstl</artifactId>
    <version>1.2</version>
</dependency>
<dependency>
    <groupId>org.hsqldb</groupId>
    <artifactId>hsqldb</artifactId>
    <version>2.2.8</version>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.20</version>
</dependency>
<dependency>
    <groupId>commons-dbcp</groupId>
    <artifactId>commons-dbcp</artifactId>
    <version>1.4</version>
</dependency>
<dependency>
    <groupId>com.github.jsimone</groupId>
    <artifactId>webapp-runner</artifactId>
    <version>7.0.27.1</version>
    <scope>provided</scope>
</dependency>


<!-- Tiles dependency -->
<dependency>
    <groupId>org.apache.tiles</groupId>
    <artifactId>tiles-core</artifactId>
    <version>2.2.1</version>
</dependency>

<dependency>
    <groupId>org.apache.tiles</groupId>
    <artifactId>tiles-jsp</artifactId>
    <version>2.2.1</version>
</dependency>
<dependency>
    <groupId>org.apache.tiles</groupId>
    <artifactId>tiles-api</artifactId>
    <version>2.2.1</version>
</dependency>
<dependency>
    <groupId>org.apache.tiles</groupId>
    <artifactId>tiles-servlet</artifactId>
    <version>2.2.1</version>
</dependency>
<dependency>
    <groupId>org.apache.tiles</groupId>
    <artifactId>tiles-template</artifactId>
    <version>2.2.1</version>
</dependency>

<!-- Security -->
<dependency>
    <groupId>org.springframework.security</groupId>
    <artifactId>spring-security-core</artifactId>
    <version>3.1.3.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework.security</groupId>
    <artifactId>spring-security-web</artifactId>
    <version>3.1.3.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework.security</groupId>
    <artifactId>spring-security-config</artifactId>
    <version>3.1.3.RELEASE</version>
</dependency>

<dependency>
    <groupId>javax.validation</groupId>
    <artifactId>validation-api</artifactId>
    <version>1.0.0.GA</version>
</dependency>
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-entitymanager</artifactId>
    <version>4.1.4.Final</version>
</dependency>
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-validator</artifactId>
    <version>4.3.1.Final</version>
</dependency>
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-c3p0</artifactId>
    <version>4.1.4.Final</version>
</dependency>
<dependency>
    <groupId>joda-time</groupId>
    <artifactId>joda-time</artifactId>
    <version>2.1</version>
</dependency>

<dependency>
    <groupId>org.codehaus.jackson</groupId>
    <artifactId>jackson-mapper-asl</artifactId>
    <version>1.9.11</version>
</dependency>
<!-- Junit API -->
<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.8.1</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-all</artifactId>
    <version>1.9.5</version>
</dependency>


<!-- JavaMail API -->
<dependency>
    <groupId>javamail</groupId>
    <artifactId>javamail</artifactId>
    <version>1.3.3</version>
</dependency>
<!-- Java Activation -->
<dependency>
    <groupId>javax.activation</groupId>
    <artifactId>activation</artifactId>
    <version>1.1.1</version>
</dependency>
<!-- JavaMail extension -->
<dependency>
    <groupId>javax.mail</groupId>
    <artifactId>mail</artifactId>
    <version>1.4.6-rc1</version>
</dependency>
<!-- LOG4J -->
<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.17</version>
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-log4j12</artifactId>
    <version>1.5.6</version>
</dependency>

<!-- The newrelic-agent.jar dependency. -->
<dependency>
    <groupId>com.newrelic.agent.java</groupId>
    <artifactId>newrelic-agent</artifactId>
    <version>2.12.0</version>
    <scope>provided</scope>
</dependency>
<!-- The newrelic-api.jar dependency. -->
<dependency>
    <groupId>com.newrelic.agent.java</groupId>
    <artifactId>newrelic-api</artifactId>
    <version>2.12.0</version>
    <scope>compile</scope>
</dependency>
<!-- The newrelic-java.zip dependency. -->
<dependency>
    <groupId>com.newrelic.agent.java</groupId>
    <artifactId>newrelic-java</artifactId>
    <version>2.12.0</version>
    <scope>provided</scope>
    <type>zip</type>
</dependency>
<dependency>
    <groupId>aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
    <version>1.5.4</version>
</dependency>
</dependencies>

<build>
<plugins>
    <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
            <source>1.6</source>
            <target>1.6</target>
        </configuration>
    </plugin>
    <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>2.2</version>
    </plugin>
    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-dependency-plugin</artifactId>
        <version>2.6</version>
        <executions>
            <execution>
                <id>unpack-zip</id>
                <phase>package</phase>
                <goals>
                    <goal>unpack-dependencies</goal>
                </goals>
                <configuration>
                    <artifactItems>
                        <artifactItem>
                            <groupId>com.newrelic.agent.java</groupId>
                            <artifactId>newrelic-java</artifactId>
                            <version>theVersion</version>
                            <type>zip</type>
                            <overWrite>true</overWrite>
                            <outputDirectory>target</outputDirectory>
                            <destFileName>newrelic</destFileName>
                        </artifactItem>
                    </artifactItems>
                    <outputDirectory>/newrelic</outputDirectory>
                </configuration>
            </execution>
            <execution>
                <phase>package</phase>
                <goals>
                    <goal>copy</goal>
                </goals>
                <configuration>
                    <artifactItems>
                        <artifactItem>
                            <groupId>com.github.jsimone</groupId>
                            <artifactId>webapp-runner</artifactId>
                            <version>7.0.27.1</version>
                            <destFileName>webapp-runner.jar</destFileName>
                        </artifactItem>
                    </artifactItems>
                </configuration>
            </execution>
        </executions>
    </plugin>
</plugins>

Persistence.xml

  <persistence-unit name="dataSource">
   <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <properties>
            <property key="hibernate.connection.provider_class">org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider</property>
            <property key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
            <property key="hibernate.show_sql">true</property>
            <property key="hibernate.hbm2ddl.auto">verify</property>
            <property key="hibernate.current_session_context_class">thread</property>
            <property key="hibernate.c3p0.acquire_increment">1</property>
            <property key="hibernate.c3p0.min_size">5</property>
            <property key="hibernate.c3p0.max_size">20</property>
            <property key="hibernate.c3p0.timeout">5000</property>
            <property key="hibernate.c3p0.max_statements">100</property>
            <property key="hibernate.c3p0.idle_test_period">3000</property>
            <property key="hibernate.c3p0.testConnectionOnCheckout">true</property>
            <property key="hibernate.c3p0.acquireRetryAttempts">1</property>
    </properties>

ApplicationContext.xml

  <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
    <property name="url"
        value="#{ 'jdbc:mysql://' + @dbUrl.getHost() + @dbUrl.getPath() }" />
    <property name="username" value="#{ @dbUrl.getUserInfo().split(':')[0] }" />
    <property name="password" value="#{ @dbUrl.getUserInfo().split(':')[1] }" />
</bean>

<bean id="entityManagerFactory"
    class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />
    </property>
</bean>