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POHow to configure Spring / Hibernate with MySQL Read-Replica
 

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  1. POHow to configure Spring / Hibernate with MySQL Read-Replica
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    <p>I have a Java application that uses Spring/Hibernate (running on Amazon Elastic Beanstalk) with a normal Amazon RDS instance. To distribute load, I'm adding a read-replica. I swapped the DB.url to the read replica and tested a method that <em>should</em> only reading data (the methods are definitely not using UPDATE, INSERT or DELETE). The application, however, is returning errors.</p> <p><strong>My questions:</strong> Why is the application failing when only reading data? How can I configure Spring/Hibernate to work with a read-replica?</p> <p><strong>The Details:</strong></p> <p>The error I'm getting is:</p> <pre><code>INFO: Internal error in method IEngageManager.getSimpleExamActivityLiveResults, ARGUMENTS=[ Credentials { (m) password=0c2a765c057a31c51b68d0f6c75cef93, (m) email=w1jg } ] com.iengage.exceptions.IEException: Internal error in method IEngageManager.getSimpleExamActivityLiveResults, ARGUMENTS=[ Credentials { (m) password=0c2a765c057a31c51b68d0f6c75cef93, (m) email=w1jg } ] at com.iengage.exceptions.ExceptionWrapper.overridingInvoke(ExceptionWrapper.java:25) at com.iengage.springobjects.SingletonMethodInterceptor.invoke(SingletonMethodInterceptor.java:18) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:621) at com.iengage.managers.IEngageManager$$EnhancerByCGLIB$$c8a2c385.getSimpleExamActivityLiveResults(&lt;generated&gt;) at com.iengage.services.IEngageService.getSimpleExamActivityLiveResults(IEngageService.java:379) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:616) at com.sun.xml.ws.api.server.InstanceResolver$1.invoke(InstanceResolver.java:246) at com.sun.xml.ws.server.InvokerTube$2.invoke(InvokerTube.java:146) at com.sun.xml.ws.server.sei.EndpointMethodHandler.invoke(EndpointMethodHandler.java:257) at com.sun.xml.ws.server.sei.SEIInvokerTube.processRequest(SEIInvokerTube.java:93) at com.sun.xml.ws.api.pipe.Fiber.__doRun(Fiber.java:595) at com.sun.xml.ws.api.pipe.Fiber._doRun(Fiber.java:554) at com.sun.xml.ws.api.pipe.Fiber.doRun(Fiber.java:539) at com.sun.xml.ws.api.pipe.Fiber.runSync(Fiber.java:436) at com.sun.xml.ws.server.WSEndpointImpl$2.process(WSEndpointImpl.java:243) at com.sun.xml.ws.transport.http.HttpAdapter$HttpToolkit.handle(HttpAdapter.java:444) at com.sun.xml.ws.transport.http.HttpAdapter.handle(HttpAdapter.java:244) at com.sun.xml.ws.transport.http.servlet.ServletAdapter.handle(ServletAdapter.java:135) at com.sun.xml.ws.transport.http.servlet.WSServletDelegate.doGet(WSServletDelegate.java:129) at com.sun.xml.ws.transport.http.servlet.WSServletDelegate.doPost(WSServletDelegate.java:160) at com.sun.xml.ws.transport.http.servlet.WSSpringServlet.doPost(WSSpringServlet.java:52) at javax.servlet.http.HttpServlet.service(HttpServlet.java:641) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:680) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:679) </code></pre> <p>The code that calls the DB:</p> <pre><code>public LecturerBO getLecturerByCode(Credentials credentials) { return findSingleResultByCriteria(LecturerBO.class,Restrictions.eq("loginCode",credentials.getPassword())); } </code></pre> <p>where</p> <pre><code>protected &lt;T&gt; T findSingleResultByCriteria(Class&lt;T&gt; clazz, Criterion... criterion) { Criteria crit = getSession().createCriteria(clazz); for (Criterion c : criterion) { crit.add(c); } return (T) crit.uniqueResult(); } </code></pre> <p>And last, the Hibernate configuration:</p> <pre><code>&lt;bean id="generalManagerProxyTemplate" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean" abstract="true"&gt; &lt;property name="transactionManager" ref="hibernateTransactionManager"/&gt; &lt;property name="proxyTargetClass" value="true"/&gt; &lt;property name="transactionAttributes"&gt; &lt;props&gt; &lt;prop key="*"&gt;PROPAGATION_REQUIRED&lt;/prop&gt; &lt;/props&gt; &lt;/property&gt; &lt;property name="preInterceptors"&gt; &lt;list&gt; &lt;bean class="com.iengage.exceptions.ExceptionWrapper"/&gt; &lt;bean class="com.iengage.utils.PerformanceLogger"/&gt; &lt;/list&gt; &lt;/property&gt; &lt;/bean&gt; &lt;bean id="hibernateTransactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"&gt; &lt;property name="sessionFactory" ref="sessionFactory"/&gt; &lt;/bean&gt; &lt;bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"&gt; &lt;property name="dataSource" ref="pooledDataSource"/&gt; &lt;property name="hibernateProperties"&gt; &lt;props&gt; &lt;prop key="hibernate.dialect"&gt;org.hibernate.dialect.MySQL5InnoDBDialect&lt;/prop&gt; &lt;prop key="transaction.auto_close_session"&gt;true&lt;/prop&gt; &lt;prop key="transaction.flush_before_completion"&gt;true&lt;/prop&gt; &lt;prop key="show_sql"&gt;false&lt;/prop&gt; &lt;prop key="hibernate.cache.use_query_cache"&gt;false&lt;/prop&gt; &lt;prop key="hibernate.show_sql"&gt;false&lt;/prop&gt; &lt;/props&gt; &lt;/property&gt; &lt;property name="annotatedClasses"&gt; &lt;bean class="com.iengage.dao.EntityList"/&gt; &lt;/property&gt; &lt;/bean&gt; &lt;bean id="pooledDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"&gt; &lt;property name="driverClassName" value="${db.driverClassName}"/&gt; &lt;property name="url" value="${db.url}"/&gt; &lt;property name="username" value="${db.username}"/&gt; &lt;property name="password" value="${db.password}"/&gt; &lt;property name="defaultAutoCommit" value="false"/&gt; &lt;property name="testWhileIdle" value="true"/&gt; &lt;/bean&gt; &lt;bean id="abstractDAO" class="com.iengage.dao.GeneralDAO" abstract="true"&gt; &lt;property name="sessionFactory" ref="sessionFactory"/&gt; &lt;property name="dataSource" ref="pooledDataSource"/&gt; &lt;/bean&gt; &lt;bean id="dao" class="com.iengage.dao.IEngageDAO" parent="abstractDAO"/&gt; </code></pre> <p>And last, as a sanity check, I did connect with the read-replica directly and via a simple script that executed SELECT queries that I hosted on a third-party server. All worked as expected.</p> <p>Also, in my research before posting this question, most answers focused on the <code>@Transactional</code> annotation, which we don't use. Sad panda.</p> <p>Thanks for any help.</p>
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