GetOrCreateCache(cfg)在使用自定义缓存配置创建缓存时引发NullPointerException

Question

我有一个测试套件，试图用IgniteCache替换ConcurrentHashMap DS。 我用相同的数据结构创建了一个IgniteCache和一个CacheConfiguration，我希望我的新IgniteCache是这样的。在运行时，它从开始到停止。在调试中，它表明在iGnite.GetOrCreateCache（cfg）上；步骤它抛出NullPointerException ；

Notes: 
1. I need to run this in embedded mode only without any external installations or external start stop service.
2. Added Ignite start and stop in spring lifecycle events of startup() and shutdown() functions. 
3. I have added the entries in maven dependency and tested the sample run. 
4. It asks for is IGNITE_HOME set? not sure where and what to do if I only want it in embedded mode 
5. Default XML file not found on output screen. I added a sample xml file with configuration and imported it into my main sprint-integration.xml file. 

        public class HarnessCache {

            Ignite ignite;
            private IgniteCache<HarnessCacheKey, ConcurrentHashMap<HarnessDataGroupKey, Object>> harnessCacheMap;
            private CacheConfiguration<HarnessCacheKey, ConcurrentHashMap<HarnessDataGroupKey, Object>> cfg;
        //  private ConcurrentHashMap<HarnessCacheKey, ConcurrentHashMap<HarnessDataGroupKey, Object>> _harnessCacheMap;


            private ConcurrentHashMap<String, List<OutMessageDto>> harnessOutMessageMap;

            public void startup() {
        //      Ignition.start("/mte-testharness/src/main/resources/spring-Ignite-cache-load.xml");
                Ignition.start();
                System.out.println("Test Harness Cache startup....");
                cfg = new CacheConfiguration<>();
                harnessCacheMap = ignite.getOrCreateCache(cfg);
                harnessOutMessageMap = new ConcurrentHashMap<String, List<OutMessageDto>>();
                System.out.println("Test Harness Cache ready....");
            }

            public void shutdown() {
                System.out.println("Test Harness Cache shutting down....");
                harnessCacheMap.clear();
                harnessOutMessageMap.clear();
                ignite.close();
            }
    }

Output console: 
[14:05:25] Configured failure handler: [hnd=StopNodeOrHaltFailureHandler [tryStop=false, timeout=0]]
[14:05:25] Message queue limit is set to 0 which may lead to potential OOMEs when running cache operations in FULL_ASYNC or PRIMARY_SYNC modes due to message queues growth on sender and receiver sides. 
[14:05:25] Security status [authentication=off, tls/ssl=off] 
[14:05:28] Performance suggestions for grid  (fix if possible) 
[14:05:28] To disable, set -DIGNITE_PERFORMANCE_SUGGESTIONS_DISABLED=true 
[14:05:28]   ^-- Enable G1 Garbage Collector (add '-XX:+UseG1GC' to JVM options) 
[14:05:28]   ^-- Specify JVM heap max size (add '-Xmx<size>[g|G|m|M|k|K]' to JVM options) 
[14:05:28]   ^-- Set max direct memory size if getting 'OOME: Direct buffer memory' (add '-XX:MaxDirectMemorySize=<size>[g|G|m|M|k|K]' to JVM options) 
[14:05:28]   ^-- Disable processing of calls to System.gc() (add '-XX:+DisableExplicitGC' to JVM options) 
[14:05:28]   ^-- Disable assertions (remove '-ea' from JVM options) 
[14:05:28] Refer to this page for more performance suggestions: https://apacheignite.readme.io/docs/jvm-and-system-tuning
[14:05:28] 
[14:05:28] To start Console Management & Monitoring run ignitevisorcmd.{sh|bat} 
[14:05:28] 
[14:05:28] Ignite node started OK (id=a9e097dd) 
[14:05:28] Topology snapshot [ver=1, servers=1, clients=0, CPUs=4, offheap=3.2GB, heap=3.5GB] 
[14:05:28]   ^-- Node [id=A9E097DD-64E1-4699-9237-65AF0E68D975, clusterState=ACTIVE] 
[14:05:28] Data Regions Configured: 
[14:05:28]   ^-- default [initSize=256.0 MiB, maxSize=3.2 GiB, persistenceEnabled=false] 
Test Harness Cache startup.... 
[14:05:28] (wrn) Default Spring XML file not found (is IGNITE_HOME set?): config/default-config.xml 
[14:05:29] (wrn) Default Spring XML file not found (is IGNITE_HOME set?): config/default-config.xml 
[14:05:29] (wrn) Default Spring XML file not found (is IGNITE_HOME set?): config/default-config.xml 
[14:05:30] (wrn) Default Spring XML file not found (is IGNITE_HOME set?): config/default-config.xml 
[14:05:30] (wrn) Default Spring XML file not found (is IGNITE_HOME set?): config/default-config.xml 
[14:05:30] Ignite node stopped OK [uptime=00:00:02.341] 

Answer 1

它在线抛出NullPointerException

   harnessCacheMap = ignite.getOrCreateCache(cfg);

因为变量ignite中没有任何设置，所以它等于NULL。如果要使用此变量，应将其设置为：

ignite = Ignition.start();