kewpiedoll99 kewpiedoll99 - 1 month ago 4
MySQL Question

MySQLSyntaxErrorException: Table XYZ doesn't exist

I am using JPA and c3p0 and attempting to query a table and getting back a stack trace claiming that the table doesn't exist. I can open a connection to the db in, for example, DbVisualizer, and see the table there. In fact, the debug statements from my app show it is able to make a connection and test its viability. But then it is not finding the table.

15:45:53.940 [http-8080-1] DEBUG o.h.e.j.i.LogicalConnectionImpl - Obtaining JDBC connection
15:45:53.940 [http-8080-1] DEBUG c.m.v.c.i.C3P0PooledConnectionPool - Testing PooledConnection [com.mchange.v2.c3p0.impl.NewPooledConnection@4d687dcd] on CHECKOUT.
15:45:53.949 [http-8080-1] DEBUG c.m.v.c.i.C3P0PooledConnectionPool - Test of PooledConnection [com.mchange.v2.c3p0.impl.NewPooledConnection@4d687dcd] on CHECKOUT has SUCCEEDED.
15:45:53.950 [http-8080-1] DEBUG c.m.v.resourcepool.BasicResourcePool - trace com.mchange.v2.resourcepool.BasicResourcePool@7930ebb [managed: 3, unused: 2, excluded: 0] (e.g. com.mchange.v2.c3p0.impl.NewPooledConnection@3e30e173)
15:45:53.950 [http-8080-1] DEBUG o.h.e.j.i.LogicalConnectionImpl - Obtained JDBC connection
15:45:53.966 [http-8080-1] DEBUG org.hibernate.SQL - select alert0_.rrdb_key as rrdb1_0_, alert0_.date as date0_, alert0_.hostname as hostname0_, alert0_.message as message0_, alert0_.program as program0_ from reportsDb.alerts alert0_ where (alert0_.message not like '%Anomolous%') and (alert0_.message not like '%Requeue%')
Hibernate: select alert0_.rrdb_key as rrdb1_0_, alert0_.date as date0_, alert0_.hostname as hostname0_, alert0_.message as message0_, alert0_.program as program0_ from reportsDb.alerts alert0_ where (alert0_.message not like '%Anomolous%') and (alert0_.message not like '%Requeue%')
15:45:54.013 [http-8080-1] DEBUG c.m.v2.c3p0.impl.NewPooledConnection - com.mchange.v2.c3p0.impl.NewPooledConnection@4d687dcd handling a throwable.
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'reportsDb.alerts' doesn't exist
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.6.0_45]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) ~[na:1.6.0_45]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) ~[na:1.6.0_45]
at java.lang.reflect.Constructor.newInstance(Constructor.java:513) ~[na:1.6.0_45]
at com.mysql.jdbc.Util.handleNewInstance(Util.java:406) ~[mysql-connector-java-5.1.6.jar:na]
...


Here is persistence.xml (in /src/main/resources/META-INF):

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
<persistence-unit name="reportsDb" transaction-type="RESOURCE_LOCAL">
<description>Hibernate</description>
<class>com.pronto.mexp.common.entity.Alert</class>
</persistence-unit>
</persistence>


A subsection of applicationContext.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd">

<bean id="jpaDialect" class="org.springframework.orm.jpa.vendor.HibernateJpaDialect"/>

<bean id="reportsDbEntityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="reportsDbDataSource" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="showSql" value="true"/>
<property name="generateDdl" value="false" />
<property name="databasePlatform" value="org.hibernate.dialect.MySQL5InnoDBDialect" />
</bean>
</property>
<property name="persistenceUnitName" value="reportsDb" />
<property name="jpaDialect" ref="jpaDialect"/>
</bean>

<bean id="reportsDbDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass" value="com.mysql.jdbc.Driver"/>
<!--<property name="jdbcUrl" value="jdbc:mysql://devdbrw01:3306/mexp"/>-->
<property name="jdbcUrl" value="jdbc:mysql://report101:3306/worker_events"/>
<property name="user" value="********"/>
<property name="password" value="********"/>
<property name="acquireRetryDelay" value="1000"/>
<property name="acquireRetryAttempts" value="4"/>
<property name="breakAfterAcquireFailure" value="false"/>
<property name="testConnectionOnCheckout" value="true"/>
<property name="maxConnectionAge" value="14400"/>
<property name="maxIdleTimeExcessConnections" value="1800"/>
</bean>

<!-- DAOs -->
<bean id="genericReportsDbDAO" class="com.pronto.mexp.common.dal.GenericReportsDbJPADAOImpl"/>

<bean id="alertJPADAO" class="com.pronto.mexp.dal.AlertJPADAOImpl" parent="genericReportsDbDAO"/>
</beans>


The thing I find suspicious is the part of the hibernate query where it tries to query
select ... from reportsDb.alerts alert0_
- how do I confirm that "reportsDb" actually stands for my data source that I spec'd in applicationContext.xml?

ETA:
The entity, Alert, looks like this:

@Entity
@Table(name = "alerts", catalog = "reportsDb")
public class Alert {

int rrdbKey;
String hostname = "";
String message = "";
String program = "";
Date date = new Date();

@javax.persistence.Column(name = "rrdb_key", nullable = false, insertable = false, updatable = false, length = 10, precision = 0)
@Id
public int getRrdbKey() {
return rrdbKey;
}

public void setRrdbKey(int rrdbKey) {
this.rrdbKey = rrdbKey;
}

@javax.persistence.Column(name = "hostname", nullable = false, insertable = false, updatable = false, length = 32, precision = 0)
@Basic
public String getHostname() {
return hostname;
}

public void setHostname(String hostname) {
this.hostname = hostname;
}

@javax.persistence.Column(name = "message", nullable = false, insertable = false, updatable = false, length = 128, precision = 0)
@Basic
public String getMessage() {
return message;
}

public void setMessage(String message) {
this.message = message;
}

@javax.persistence.Column(name = "program", nullable = true, insertable = false, updatable = false, length = 40, precision = 0)
@Basic
public String getProgram() {
return program;
}

public void setProgram(String program) {
this.program = program;
}

@javax.persistence.Column(name = "date", nullable = false, insertable = false, updatable = false, length = 19, precision = 0)
@Basic
public Date getDate() {
return date;
}

public void setDate(Date date) {
this.date = date;
}
}

Answer

From your entity definition, remove the "catalog = 'reportsDb'" part, since it is being used to build the query like ""select from 'reportsDb.alerts'". Mysql doesn't use catalogs, AFAIK.

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