我有一个3节点Apache Ignite Cluster，我创建了一个以Integer作为Key的缓存和一个'Subscriber'POJO作为值，当我从JAVA程序内部连接到集群并访问缓存时，我得到了上述内容提到异常，我将'peerclassloading'属性设置为false，并且我已在所有节点中部署了'Subscriber'POJO Binaries，请在下面找到完整的堆栈跟踪。我在这里错过了什么？当我使用Ignition.start()在JAVA程序中启动客户端时，为什么要在IGNITE_HOME中查找某个文件？
class org.apache.ignite.IgniteCheckedException: Failed to read class name from file [id=-1219769240, file=/home/benakaraj/Downloads/apache-ignite-fabric-1.5.0.final-bin/work/marshaller/-1219769240.classname]
at org.apache.ignite.internal.MarshallerContextImpl.className(MarshallerContextImpl.java:158)
at org.apache.ignite.internal.MarshallerContextAdapter.getClass(MarshallerContextAdapter.java:174)
at org.apache.ignite.internal.binary.BinaryContext.descriptorForTypeId(BinaryContext.java:483)
at org.apache.ignite.internal.binary.BinaryReaderExImpl.deserialize(BinaryReaderExImpl.java:1443)
at org.apache.ignite.internal.binary.BinaryObjectImpl.deserializeValue(BinaryObjectImpl.java:537)
at org.apache.ignite.internal.binary.BinaryObjectImpl.value(BinaryObjectImpl.java:117)
at org.apache.ignite.internal.processors.cache.CacheObjectContext.unwrapBinary(CacheObjectContext.java:280)
at org.apache.ignite.internal.processors.cache.CacheObjectContext.unwrapBinaryIfNeeded(CacheObjectContext.java:145)
at org.apache.ignite.internal.processors.cache.CacheObjectContext.unwrapBinaryIfNeeded(CacheObjectContext.java:132)
at org.apache.ignite.internal.processors.cache.GridCacheContext.unwrapBinaryIfNeeded(GridCacheContext.java:1748)
at org.apache.ignite.internal.processors.cache.distributed.dht.GridPartitionedSingleGetFuture.setResult(GridPartitionedSingleGetFuture.java:598)
at org.apache.ignite.internal.processors.cache.distributed.dht.GridPartitionedSingleGetFuture.onResult(GridPartitionedSingleGetFuture.java:454)
at org.apache.ignite.internal.processors.cache.distributed.dht.GridDhtCacheAdapter.processNearSingleGetResponse(GridDhtCacheAdapter.java:153)
at org.apache.ignite.internal.processors.cache.distributed.dht.atomic.GridDhtAtomicCache.access$1200(GridDhtAtomicCache.java:128)
at org.apache.ignite.internal.processors.cache.distributed.dht.atomic.GridDhtAtomicCache$11.apply(GridDhtAtomicCache.java:295)
at org.apache.ignite.internal.processors.cache.distributed.dht.atomic.GridDhtAtomicCache$11.apply(GridDhtAtomicCache.java:293)
at org.apache.ignite.internal.processors.cache.GridCacheIoManager.processMessage(GridCacheIoManager.java:582)
at org.apache.ignite.internal.processors.cache.GridCacheIoManager.onMessage0(GridCacheIoManager.java:280)
at org.apache.ignite.internal.processors.cache.GridCacheIoManager.handleMessage(GridCacheIoManager.java:204)
at org.apache.ignite.internal.processors.cache.GridCacheIoManager.access$000(GridCacheIoManager.java:80)
at org.apache.ignite.internal.processors.cache.GridCacheIoManager$1.onMessage(GridCacheIoManager.java:163)
at org.apache.ignite.internal.managers.communication.GridIoManager.processRegularMessage0(GridIoManager.java:821)
at org.apache.ignite.internal.managers.communication.GridIoManager.access$1600(GridIoManager.java:103)
at org.apache.ignite.internal.managers.communication.GridIoManager$5.run(GridIoManager.java:784)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.FileNotFoundException: /home/benakaraj/Downloads/apache-ignite-fabric-1.5.0.final-bin/work/marshaller/-1219769240.classname (No such file or directory)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:138)
at java.io.FileReader.<init>(FileReader.java:72)
at org.apache.ignite.internal.MarshallerContextImpl.className(MarshallerContextImpl.java:154)
... 26 more
答案 0 :(得分：1)
看起来缓存在从缓存中检索后尝试反序列化该值，但是在调用IgniteCache.get()的节点上没有为它设置类。您可以部署该类，也可以使用IgniteCache.withKeepBinary()来避免反序列化：https://apacheignite.readme.io/docs/binary-marshaller#binaryobject-cache-api
答案 1 :(得分：0)
问题变得非常简单，Ignite从默认类加载器加载的类列表中查找用户定义的POJO，如果它没有在那里找到它，它看起来在marshalled类中，在我的情况下，我的值POJO在测试资源中，因此默认的类加载器没有加载类，导致ignite查看marshalled classes文件夹（IGNITE_HOME / work / marshaller /）。