Java 如何在JPA中使用命名查询而不必在persistence.xml中列出实体？

我能够检索和持久化实体，而无需将其列在

persistence.xml

中，但如果我想使用

@NamedQuery

，除非我将其列在

persistence.xml

中，否则它无法工作。有办法解决这个问题吗

我正在使用Tomcat8和OpenJPA2.4.2

persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence
        version="2.1"
        xmlns="http://xmlns.jcp.org/xml/ns/persistence"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">

    <!-- Used for persisting events, authentication pieces -->
    <persistence-unit name="PushPersistence" transaction-type="RESOURCE_LOCAL">

        <!-- Use Apache's OpenJPA -->
        <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>

        <!-- Our backing store is our data source from context.xml -->
        <non-jta-data-source>java:comp/env/jdbc/webservice</non-jta-data-source>

        <!--
            Without this, I can load and persist the entity but 
            CANNOT use Named Queries                        
        -->
        <class>push.authentication.AuthCredentials</class>

        <!-- Don't require listing the managed classes here -->
        <exclude-unlisted-classes>false</exclude-unlisted-classes>

        <properties>
            <property name="openjpa.DynamicEnhancementAgent" value="true"/>
            <property name="openjpa.RuntimeUnenhancedClasses" value="supported"/>
            <property name="openjpa.Log" value="SQL=TRACE"/>
            <property name="openjpa.ConnectionFactoryProperties" value="PrettyPrint=true, PrettyPrintLineLength=72, PrintParameters=true, MaxActive=10, MaxIdle=5, MinIdle=2, MaxWait=60000"/>
        </properties>

    </persistence-unit>
</persistence>

---

我阅读了EntityManager接口，它说如果查询没有用给定的名称定义，或者如果发现查询字符串无效，或者如果发现查询结果不可分配给指定的类型，并且如果根据代码片段获取IllegalArgumentException，它将抛出IllegalArgumentException，我认为第三个是你的情况下，尝试使用

EntityManager.createNamedQuery(java.lang.String name);

而不是

EntityManager.createNamedQuery(java.lang.String name,
                               java.lang.Class<T> resultClass);

EntityManager.createNamedQuery（java.lang.String名称，
java.lang.Class resultClass）；

看看你是否得到同样的结果

EntityManager.createNamedQuery(java.lang.String name);

EntityManager.createNamedQuery(java.lang.String name,
                               java.lang.Class<T> resultClass);