Java 如何在播放模型中表示oracle blob

我需要将一个BLOB列（字段名：FOTO）从Oracle加载到Java Play Framework。我尝试在我的模型中使用java.sql.Blob（模型名：ESTUDIANTE），但是我遇到了这个错误

[error] c.a.e.s.t.r.ImmutableMetaFactory - Was unable to use reflection to find a constructor and appropriate getters forimmutable type interface java
.sql.Blob.  The errors while looking for the getter methods follow:
[error] c.a.e.s.d.p.DeployCreateProperties - Error with models.Estudiante field:foto
java.lang.RuntimeException: Unable to use reflection to build ImmutableMeta for interface java.sql.Blob.  Associated Errors trying to find a construct
or and getter methods have been logged
        at com.avaje.ebeaninternal.server.type.reflect.ImmutableMetaFactory.createImmutableMeta(ImmutableMetaFactory.java:53) ~[avaje-ebeanorm.jar:na]

        at com.avaje.ebeaninternal.server.type.DefaultTypeManager.recursiveCreateScalarTypes(DefaultTypeManager.java:205) ~[avaje-ebeanorm.jar:na]
        at com.avaje.ebeaninternal.server.deploy.parse.DeployCreateProperties.createProp(DeployCreateProperties.java:321) [avaje-ebeanorm.jar:na]
        at com.avaje.ebeaninternal.server.deploy.parse.DeployCreateProperties.createProp(DeployCreateProperties.java:341) [avaje-ebeanorm.jar:na]
        at com.avaje.ebeaninternal.server.deploy.parse.DeployCreateProperties.createProperties(DeployCreateProperties.java:128) [avaje-ebeanorm.jar:na
]
        at com.avaje.ebeaninternal.server.deploy.parse.DeployCreateProperties.createProperties(DeployCreateProperties.java:54) [avaje-ebeanorm.jar:na]

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我做错什么了吗？是否有其他java数据类型来处理blob？

您也可以使用javax.persistence.Lob

@Lob
//Use basic annotation only if you need to LAZY load. 
@Basic(fetch = LAZY)
public byte[] data; 

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默认情况下，java原语上提供了@Basic（fetch=EAGER），因此在这种情况下注释@Basic是可选的。

感谢您的回复，我不再收到错误，但是

foto

字段总是获取空值，我检查数据库字段是否为空，这可能是什么？您是否使用了fetch=LAZY？如果要获取EAGER，请尝试使用fetch=EAGER