Spring JPA Throws "Unknown entity" exception - java-8

Question

Jdk 1.8.0_82, Springboot 1.3.8 and JPA.
I want insert new rows made from existing object value.
I Just call
List<LogSchemaFieldModel> newFields = Lists.newArrayList();
for(LogSchemaFieldModel f : fields){
newFields.add(new LogSchemaFieldModel(){{
setFieldName( f.getFieldName() );
setFieldType( f.getFieldType() );
setFieldOpt( Field.Mode.NULLABLE.toString() );
setDescription( f.getDescription() );
setSampleValue( f.getSampleValue() );
setCommon(true);
setRequired(null);
}});
}
repo.save(newFields);
but it throws this exception.
org.springframework.dao.InvalidDataAccessApiUsageException: Unknown entity: com......service.LogDefineService$6; nested exception is java.lang.IllegalArgumentException: Unknown entity: com......service.LogDefineService$6
at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:384) ~[spring-orm-4.2.8.RELEASE.jar:4.2.8.RELEASE]
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:227) ~[spring-orm-4.2.8.RELEASE.jar:4.2.8.RELEASE]
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:436) ~[spring-orm-4.2.8.RELEASE.jar:4.2.8.RELEASE]
at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:59) ~[spring-tx-4.2.8.RELEASE.jar:4.2.8.RELEASE]
at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213) ~[spring-tx-4.2.8.RELEASE.jar:4.2.8.RELEASE]
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:147) ~[spring-tx-4.2.8.RELEASE.jar:4.2.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.2.8.RELEASE.jar:4.2.8.RELEASE]
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:131) ~[spring-data-jpa-1.9.5.RELEASE.jar:na]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.2.8.RELEASE.jar:4.2.8.RELEASE]
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) ~[spring-aop-4.2.8.RELEASE.jar:4.2.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.2.8.RELEASE.jar:4.2.8.RELEASE]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208) ~[spring-aop-4.2.8.RELEASE.jar:4.2.8.RELEASE]
at com.sun.proxy.$Proxy119.save(Unknown Source) ~[na:na]
at com.my...

Answer 1

finally, I found solution.
remove double brace initialize.
List<LogSchemaFieldModel> newFields = Lists.newArrayList();
for(LogSchemaFieldModel f : fields){
LogSchemaFieldModel nf = new LogSchemaFieldModel();
nf.setFieldName( f.getFieldName() );
nf.setFieldType( f.getFieldType() );
nf.setFieldOpt( Field.Mode.NULLABLE.toString() );
nf.setDescription( f.getDescription() );
nf.setSampleValue( f.getSampleValue() );
nf.setCommon(true);
nf.setRequired(null);
newFields.add(nf);
}
repo.save(newFields);
But I don`t knwow why it works.
is it java8 double brace initialization bug?