问题描述
我正在使用objectify 6.0从GAE数据存储中检索数据。数据存储区表除id之外还具有7个字段，如下所示。
package org.skoonline.atl.dataservice.entities;
import com.google.appengine.api.users.User;
import com.googlecode.objectify.annotation.Entity;
import com.googlecode.objectify.annotation.Id;
import com.googlecode.objectify.annotation.Index;
import com.googlecode.objectify.Key;
import com.google.appengine.api.datastore.Blob;
import java.util.Date;
@Entity
public class SKOScriptHistory {
//@Id String id;
@Id Key<String> id;
@Index String guid;
User lastUpdatedBy;
String notes;
@Index Date timestamp;
String scriptContent;
Blob scriptContentBlob;
String title;
@Override
public String toString() {
return "hello string";
}
public String getGuid() {
return guid;
}
public void setGuid(String guid) {
this.guid = guid;
}
public Date getTimestamp() {
return timestamp;
}
public void setTimestamp(Date timestamp) {
this.timestamp = timestamp;
}
public User getLastUpdatedBy() {
return lastUpdatedBy;
}
public void setLastUpdatedBy(User lastUpdatedBy) {
this.lastUpdatedBy = lastUpdatedBy;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getScriptContent() {
return scriptContent;
}
public void setScriptContent(String scriptContent) {
this.scriptContent = scriptContent;
}
public Blob getScriptContentBlob() {/// Changes
return scriptContentBlob;
}
public void setScriptContentBlob(Blob scriptContentBlob) {/// Changes
this.scriptContentBlob = scriptContentBlob;
}
public String getNotes() {
return notes;
}
public void setNotes(String notes) {
this.notes = notes;
}
public Key getKey() {
return id;
}
}
使用下一行，我试图从表中检索一行
SKOScriptHistory tmp = ofy().load().type(SKOScriptHistory.class).first().Now();
但是得到这些例外
com.googlecode.objectify.LoadException: Error loading Key..Expected type ENTITY at path '%' but instead found scriptContentBlob [BLOB]
java.lang.IllegalArgumentException: Expected type ENTITY at path '%' but instead found scriptContentBlob [BLOB]
完全例外在下面
com.googlecode.objectify.LoadException: Error loading Key{projectId=backupsko-1470660825968,namespace=,path=[pathelement{kind=SKOScriptHistory,id=4645925137940480,name=null}]}: Expected type ENTITY at path '%' but instead found scriptContentBlob [BLOB]
at com.googlecode.objectify.impl.EntityMetadata.load(EntityMetadata.java:84)
at com.googlecode.objectify.impl.LoadEngine.load(LoadEngine.java:196)
at com.googlecode.objectify.impl.LoadEngine$1.NowUncached(LoadEngine.java:154)
at com.googlecode.objectify.impl.LoadEngine$1.NowUncached(LoadEngine.java:140)
at com.googlecode.objectify.util.ResultCache.Now(ResultCache.java:30)
at com.googlecode.objectify.impl.Round$1.NowUncached(Round.java:66)
at com.googlecode.objectify.util.ResultCache.Now(ResultCache.java:30)
at com.googlecode.objectify.impl.HybridQueryResults.lambda$load$1(HybridQueryResults.java:88)
at com.google.common.collect.Iterators$6.transform(Iterators.java:786)
at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:47)
at com.google.common.collect.Iterators$ConcatenatedIterator.next(Iterators.java:1372)
at com.google.common.collect.Iterators$5.computeNext(Iterators.java:636)
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:141)
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:136)
at com.googlecode.objectify.impl.HybridQueryResults.hasNext(HybridQueryResults.java:93)
at com.googlecode.objectify.util.IteratorFirstResult.NowUncached(IteratorFirstResult.java:31)
at com.googlecode.objectify.util.ResultCache.Now(ResultCache.java:30)
at com.googlecode.objectify.LoadResult.Now(LoadResult.java:25)
at org.skoonline.atl.dataservice.MyScriptsServlet.doPost(MyScriptsServlet.java:103)
at org.skoonline.atl.dataservice.MyScriptsServlet.doGet(MyScriptsServlet.java:45)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder$NotAsyncServlet.service(ServletHolder.java:1395)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:755)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1617)
at com.googlecode.objectify.ObjectifyFilter.doFilter(ObjectifyFilter.java:48)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)
at com.googlecode.objectify.ObjectifyFilter.doFilter(ObjectifyFilter.java:48)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)
at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:134)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)
at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)
at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:48)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)
at com.google.appengine.tools.development.jetty9.StaticFileFilter.doFilter(StaticFileFilter.java:123)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)
at com.google.appengine.tools.development.DevAppServerRequestLogFilter.doFilter(DevAppServerRequestLogFilter.java:28)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1596)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:545)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:566)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1610)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1300)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:485)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1580)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1215)
at com.google.appengine.tools.development.jetty9.DevAppEngineWebAppContext.doScope(DevAppEngineWebAppContext.java:94)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
at com.google.appengine.tools.development.jetty9.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:610)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
at org.eclipse.jetty.server.Server.handle(Server.java:500)
at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:383)
at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:547)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:375)
at org.eclipse.jetty.server.httpconnection.onFillable(httpconnection.java:273)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129)
at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:375)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:806)
at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:938)
at java.lang.Thread.run(Thread.java:748)
Caused by:
java.lang.IllegalArgumentException: Expected type ENTITY at path '%' but instead found scriptContentBlob [BLOB]
at com.google.common.base.Preconditions.checkArgument(Preconditions.java:462)
at com.googlecode.objectify.impl.translate.Classtranslator.loadSafe(Classtranslator.java:90)
at com.googlecode.objectify.impl.translate.NullSafeTranslator.load(NullSafeTranslator.java:21)
at com.googlecode.objectify.impl.PropertyPopulator.setValue(PropertyPopulator.java:95)
at com.googlecode.objectify.impl.PropertyPopulator.load(PropertyPopulator.java:55)
at com.googlecode.objectify.impl.translate.Classpopulator.load(Classpopulator.java:119)
at com.googlecode.objectify.impl.translate.Classtranslator.loadSafe(Classtranslator.java:113)
at com.googlecode.objectify.impl.translate.NullSafeTranslator.load(NullSafeTranslator.java:21)
at com.googlecode.objectify.impl.EntityMetadata.load(EntityMetadata.java:80)
at com.googlecode.objectify.impl.LoadEngine.load(LoadEngine.java:196)
at com.googlecode.objectify.impl.LoadEngine$1.NowUncached(LoadEngine.java:154)
at com.googlecode.objectify.impl.LoadEngine$1.NowUncached(LoadEngine.java:140)
at com.googlecode.objectify.util.ResultCache.Now(ResultCache.java:30)
at com.googlecode.objectify.impl.Round$1.NowUncached(Round.java:66)
at com.googlecode.objectify.util.ResultCache.Now(ResultCache.java:30)
at com.googlecode.objectify.impl.HybridQueryResults.lambda$load$1(HybridQueryResults.java:88)
at com.google.common.collect.Iterators$6.transform(Iterators.java:786)
at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:47)
at com.google.common.collect.Iterators$ConcatenatedIterator.next(Iterators.java:1372)
at com.google.common.collect.Iterators$5.computeNext(Iterators.java:636)
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:141)
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:136)
at com.googlecode.objectify.impl.HybridQueryResults.hasNext(HybridQueryResults.java:93)
at com.googlecode.objectify.util.IteratorFirstResult.NowUncached(IteratorFirstResult.java:31)
at com.googlecode.objectify.util.ResultCache.Now(ResultCache.java:30)
at com.googlecode.objectify.LoadResult.Now(LoadResult.java:25)
at org.skoonline.atl.dataservice.MyScriptsServlet.doPost(MyScriptsServlet.java:103)
at org.skoonline.atl.dataservice.MyScriptsServlet.doGet(MyScriptsServlet.java:45)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder$NotAsyncServlet.service(ServletHolder.java:1395)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:755)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1617)
at com.googlecode.objectify.ObjectifyFilter.doFilter(ObjectifyFilter.java:48)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)
at com.googlecode.objectify.ObjectifyFilter.doFilter(ObjectifyFilter.java:48)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)
at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:134)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)
at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)
at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:48)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)
at com.google.appengine.tools.development.jetty9.StaticFileFilter.doFilter(StaticFileFilter.java:123)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)
at com.google.appengine.tools.development.DevAppServerRequestLogFilter.doFilter(DevAppServerRequestLogFilter.java:28)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1596)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:545)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:566)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1610)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1300)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:485)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1580)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1215)
at com.google.appengine.tools.development.jetty9.DevAppEngineWebAppContext.doScope(DevAppEngineWebAppContext.java:94)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
at com.google.appengine.tools.development.jetty9.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:610)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
at org.eclipse.jetty.server.Server.handle(Server.java:500)
at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:383)
at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:547)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:375)
at org.eclipse.jetty.server.httpconnection.onFillable(httpconnection.java:273)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129)
at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:375)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:806)
at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:938)
at java.lang.Thread.run(Thread.java:748)
我正在将Google App Engine应用程序从Java7迁移到Java8，并且非常新颖。有没有人遇到类似的问题？感谢您的帮助。
谢谢
解决方法
Objectify v6对旧的SELECT t.VALUE FROM ignite.node_attributes t WHERE t.name = 'MONITOR_NODE'
类一无所知。因此，当数据库内容为com.google.appengine.api.datastore类型时，Objectify尝试将Blob类视为普通的嵌入式对象（“期望的ENTITY”）。
最好的办法是用一个简单的Blob替换Blob。但是您也可以用以下代码替换它：
https://googleapis.dev/java/google-cloud-datastore/latest/com/google/cloud/datastore/Blob.html
请注意byte[]软件包。
顺便说一句，“在路径'％'处”是错误消息中的错误，已在v6.0.7中修复。