休眠错误：方法太大（超过 65535 字节大小）答案

【问题标题】：Hibernate error: Method too large (exceeding 65535 bytes size)休眠错误：方法太大（超过 65535 字节大小）
【发布时间】：2019-12-28 04:10:58
【问题描述】：

我的@Entity 有 5059 个字段（我知道...不要告诉我），并且在使用休眠模式启动我的 Spring Boot 应用程序时出现以下错误。我的 ddl auto 设置为“none”。

我选择的数据库是 H2，从我阅读的 here 和 there 来看，它对列数没有限制。另一方面，Oracle 有 1000 列的限制，这让我很担心。

如果需要，我当然可以发布我的实体，但我可以告诉你，所有字段都是 CustomString 和 CustomDouble 类型，它们通过 @Converter 转换为 String 和 Double。

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory; nested exception is org.hibernate.MappingException: Could not get constructor for org.hibernate.persister.entity.SingleTableEntityPersister
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1778) ~[spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE]
        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE]
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE]
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE]
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE]
        at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1105) ~[spring-context-5.1.9.RELEASE.jar:5.1.9.RELEASE]
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) ~[spring-context-5.1.9.RELEASE.jar:5.1.9.RELEASE]
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) ~[spring-context-5.1.9.RELEASE.jar:5.1.9.RELEASE]
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.1.7.RELEASE.jar:2.1.7.RELEASE]
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:743) [spring-boot-2.1.7.RELEASE.jar:2.1.7.RELEASE]
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:390) [spring-boot-2.1.7.RELEASE.jar:2.1.7.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:312) [spring-boot-2.1.7.RELEASE.jar:2.1.7.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1214) [spring-boot-2.1.7.RELEASE.jar:2.1.7.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1203) [spring-boot-2.1.7.RELEASE.jar:2.1.7.RELEASE]
        at com.validator.TranspilerValidatorApp.main(TranspilerValidatorApp.java:10) [classes/:na]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_172]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_172]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_172]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_172]
        at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.1.7.RELEASE.jar:2.1.7.RELEASE]
    Caused by: javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory; nested exception is org.hibernate.MappingException: Could not get constructor for org.hibernate.persister.entity.SingleTableEntityPersister
        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:402) ~[spring-orm-5.1.9.RELEASE.jar:5.1.9.RELEASE]
        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:377) ~[spring-orm-5.1.9.RELEASE.jar:5.1.9.RELEASE]
        at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341) ~[spring-orm-5.1.9.RELEASE.jar:5.1.9.RELEASE]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1837) ~[spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1774) ~[spring-beans-5.1.9.RELEASE.jar:5.1.9.RELEASE]
        ... 21 common frames omitted
    Caused by: org.hibernate.MappingException: Could not get constructor for org.hibernate.persister.entity.SingleTableEntityPersister
        at org.hibernate.persister.internal.PersisterFactoryImpl.createEntityPersister(PersisterFactoryImpl.java:123) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        at org.hibernate.persister.internal.PersisterFactoryImpl.createEntityPersister(PersisterFactoryImpl.java:77) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        at org.hibernate.metamodel.internal.MetamodelImpl.initialize(MetamodelImpl.java:154) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:295) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:467) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:939) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:57) ~[spring-orm-5.1.9.RELEASE.jar:5.1.9.RELEASE]
        at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365) ~[spring-orm-5.1.9.RELEASE.jar:5.1.9.RELEASE]
        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:390) ~[spring-orm-5.1.9.RELEASE.jar:5.1.9.RELEASE]
        ... 25 common frames omitted
    Caused by: org.hibernate.HibernateException: Unable to instantiate default tuplizer [org.hibernate.tuple.entity.PojoEntityTuplizer]
        at org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:91) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        at org.hibernate.tuple.entity.EntityTuplizerFactory.constructDefaultTuplizer(EntityTuplizerFactory.java:116) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:382) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:554) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:124) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_172]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_172]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_172]
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_172]
        at org.hibernate.persister.internal.PersisterFactoryImpl.createEntityPersister(PersisterFactoryImpl.java:96) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        ... 33 common frames omitted
    Caused by: java.lang.reflect.InvocationTargetException: null
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_172]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_172]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_172]
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_172]
        at org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:88) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        ... 42 common frames omitted
    Caused by: java.lang.IllegalArgumentException: Could not create type
        at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:154) ~[byte-buddy-1.9.16.jar:na]
        at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:365) ~[byte-buddy-1.9.16.jar:na]
        at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:174) ~[byte-buddy-1.9.16.jar:na]
        at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:376) ~[byte-buddy-1.9.16.jar:na]
        at org.hibernate.bytecode.internal.bytebuddy.ByteBuddyState.load(ByteBuddyState.java:183) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        at org.hibernate.bytecode.internal.bytebuddy.ByteBuddyState.loadProxy(ByteBuddyState.java:107) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        at org.hibernate.proxy.pojo.bytebuddy.ByteBuddyProxyHelper.buildProxy(ByteBuddyProxyHelper.java:54) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        at org.hibernate.proxy.pojo.bytebuddy.ByteBuddyProxyFactory.postInstantiate(ByteBuddyProxyFactory.java:62) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        at org.hibernate.tuple.entity.PojoEntityTuplizer.buildProxyFactory(PojoEntityTuplizer.java:162) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        at org.hibernate.tuple.entity.AbstractEntityTuplizer.<init>(AbstractEntityTuplizer.java:156) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        at org.hibernate.tuple.entity.PojoEntityTuplizer.<init>(PojoEntityTuplizer.java:58) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        ... 47 common frames omitted
    Caused by: net.bytebuddy.jar.asm.MethodTooLargeException: Method too large: com/validator/Entity/Bean/EeWmoHigh$HibernateProxy$V6rckrtc.<clinit> ()V
        at net.bytebuddy.jar.asm.MethodWriter.computeMethodInfoSize(MethodWriter.java:2084) ~[byte-buddy-1.9.16.jar:na]
        at net.bytebuddy.jar.asm.ClassWriter.toByteArray(ClassWriter.java:447) ~[byte-buddy-1.9.16.jar:na]
        at net.bytebuddy.dynamic.scaffold.TypeWriter$Default$ForCreation.create(TypeWriter.java:5171) ~[byte-buddy-1.9.16.jar:na]
        at net.bytebuddy.dynamic.scaffold.TypeWriter$Default.make(TypeWriter.java:1933) ~[byte-buddy-1.9.16.jar:na]
        at net.bytebuddy.dynamic.scaffold.subclass.SubclassDynamicTypeBuilder.make(SubclassDynamicTypeBuilder.java:225) ~[byte-buddy-1.9.16.jar:na]
        at net.bytebuddy.dynamic.scaffold.subclass.SubclassDynamicTypeBuilder.make(SubclassDynamicTypeBuilder.java:198) ~[byte-buddy-1.9.16.jar:na]
        at net.bytebuddy.dynamic.DynamicType$Builder$AbstractBase.make(DynamicType.java:3404) ~[byte-buddy-1.9.16.jar:na]
        at net.bytebuddy.dynamic.DynamicType$Builder$AbstractBase$Delegator.make(DynamicType.java:3600) ~[byte-buddy-1.9.16.jar:na]
        at org.hibernate.bytecode.internal.bytebuddy.ByteBuddyState.make(ByteBuddyState.java:207) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        at org.hibernate.bytecode.internal.bytebuddy.ByteBuddyState.make(ByteBuddyState.java:193) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        at org.hibernate.bytecode.internal.bytebuddy.ByteBuddyState.lambda$load$0(ByteBuddyState.java:186) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
        at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:152) ~[byte-buddy-1.9.16.jar:na]
        ... 57 common frames omitted

我的实体这么大，hibernate 无法处理吗？
如何更好地跟踪此异常？我应该寻找什么？

当 Hibernate 检查一个 ByteVector 的长度大于 65535 时抛出异常。

编辑：我进行了一些调试，并注意到当 bytebuddy 为我的@Entity 构建休眠代理时会引发错误。

在我看来@Scarabelo 是对的。虽然，更难事先检查类的长度，因为 hibernate 会创建它的代理，之后会更大。

【问题讨论】：

标签： java hibernate spring-boot jpa h2

【解决方案1】：

我认为您的问题不在于 Hibernate 是 Java 方法的限制，因为 Java 中对于方法大小有 64Kb 的任意硬编码限制。（实际上很多其他的东西都被限制在 64K 以内，例如方法名称、常量的数量等。有关详细信息，请参阅 Java 8 规范或 Java 7 规范。）

【讨论】：

我看了看，请帮助我更好地理解它：ClassFile结构的16位constant_pool_count字段将每个类或每个接口的常量池限制为65535个条目（§ 4.1）。这充当了对单个类或接口的总复杂性的内部限制。类或接口可以声明的字段数受 ClassFile 结构的 fields_count 项的大小限制为 65535（第 4.1 节）。它从未提到 65535 字节大小。它把它称为计数。我看不到任何可能超出的计数。
我认为是因为java方法上的每个字符都有2个字节的大小，所以你只有6.4个字符来声明每一列，如果你超过了，你的方法将超过限制字节
所以当规范提到方法名称的限制时，它是在谈论字节大小，而不是方法的数量。规范并不清楚...
这里稍微解释一下，我从文档中摘取：end_pc 是独占的事实是Java 虚拟机设计中的一个历史错误：如果一个方法的Java 虚拟机代码完全是65535 字节长并以 1 字节长的指令结束，则该指令无法受到异常处理程序的保护。编译器编写者可以通过将任何方法、实例初始化方法或静态初始化程序（任何代码数组的大小）生成的 Java 虚拟机代码的最大大小限制为 65534 字节来解决此错误。
那么，在这种情况下，类是否被视为 JVM 的方法？我的课程肯定大于 65535 字节...