Question

我的spring webapp使用PostgreSQL，只有一些功能是数据库绑定的。我想在没有数据库连接的情况下部署应用程序。

如果没有数据库，dataSource bean会在启动时爆炸......并且所有后续请求都会因为bean 500s而失败，因为bean创建错误会停止应用程序初始化。

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [database.xml]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1578)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:305)
    etc.
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.persistenceException(EntityManagerFactoryBuilderImpl.java:877)
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:805)
    at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:60)
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:343)
    etc.
Caused by: org.hibernate.exception.JDBCConnectionException: Unable to obtain JDBC Connection
    at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:115)
    at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:109)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:95)
    etc.
Caused by: org.postgresql.util.PSQLException: Connection to localhost:5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
    at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:247)
    at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:65)
    at org.postgresql.jdbc2.AbstractJdbc2Connection.<init>(AbstractJdbc2Connection.java:146)
    at org.postgresql.jdbc3.AbstractJdbc3Connection.<init>(AbstractJdbc3Connection.java:35)
    etc.

数据源定义

<bean id="dataSource"
    class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="org.postgresql.Driver" />
    <property name="url" value="jdbc:postgresql://localhost:5432/sadb" />

    <property name="username" value="sa" />
    <property name="password" value="password" />
</bean>

当然这应该是可能的吗？我做了很多搜索，但无法找到相关内容。

Answer 1

尝试使用嵌入式内存数据库，如h2或hsqldb

<jdbc:embedded-database id="dataSource" type="HSQL"/>

或

<jdbc:embedded-database id="dataSource" type="H2"/>

如果您不想使用jdbc名称空间

<bean id="dataSource"  class="org.springframework.jdbc.datasource.SimpleDriverDataSource">
        <property name="driverClass" value="org.h2.Driver"/>
        <property name="url" value="jdbc:h2:mem:test"/>
        <property name="username" value="sa"/>
        <property name="password" value=""/>
</bean>

Answer 2

我没有对此进行测试，但通过设置lazy-init =“true”来检查是否通过将数据库相关bean标记为懒惰加载来检查它是否有效。像这样：

<bean id="dataSource"  class="org.springframework.jdbc.datasource.SimpleDriverDataSource" lazy-init=”true”>
    <property name="driverClass" value="org.h2.Driver"/>
    <property name="url" value="jdbc:h2:mem:test"/>
    <property name="username" value="sa"/>
    <property name="password" value=""/>

Answer 3

我们在项目中面临同样的问题，我们通过实例化解决了问题豆懒惰（lazy-init =“true”）如下：

    <bean id="myProjectDataSource" 
    class="org.apache.commons.dbcp.BasicDataSource" 
    destroy-method="close" 
    lazy-init="true">

如何在没有数据库连接的情况下部署spring应用程序

3 个答案: