本文整理了Java中javax.persistence.Persistence.exists()方法的一些代码示例，展示了Persistence.exists()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Persistence.exists()方法的具体详情如下：
包路径：javax.persistence.Persistence
类名称：Persistence
方法名：exists

Persistence.exists介绍

暂无

代码示例

代码示例来源：origin: javax.persistence/persistence-api

"No Persistence provider for EntityManager named " +
     persistenceUnitName + ": ");
if (!exists(PERSISTENCE_XML_NAME)) {
  message.append (" No META-INF/persistence.xml was found in classpath.\n");
} else {

代码示例来源：origin: toplink.essentials/toplink-essentials

"No Persistence provider for EntityManager named " +
     persistenceUnitName + ": ");
if (!exists(PERSISTENCE_XML_NAME)) {
  message.append (" No META-INF/persistence.xml was found in classpath.\n");
} else {