我的代码启动节点并执行loadCache（）方法，但是当对它应用SQL查询时，它给出了标题中提到的错误。这是我的配置，缓存存储和loadcache的代码：
Configuration.java：
public class Configuration {
/** Helper class for datasource creation. **/
public static class DataSources {
public static final JdbcDataSource dataSource = createdataSource();
private static JdbcDataSource createdataSource() {
JdbcDataSource dataSource = new JdbcDataSource();
dataSource.setURL("");
dataSource.setUser("");
dataSource.setPassword("");
return dataSource;
}
}
/**
* Configure grid.
*
* @return Ignite configuration.
* @throws Exception If failed to construct Ignite configuration instance.
**/
public static IgniteConfiguration createConfiguration() throws Exception {
//int cpus = Runtime.getRuntime().availableProcessors();
IgniteConfiguration cfg = new IgniteConfiguration();
cfg.setClientMode(true);
cfg.setIgniteInstanceName("Reports");
TcpDiscoverySpi discovery = new TcpDiscoverySpi();
TcpDiscoveryMulticastIpFinder ipFinder = new TcpDiscoveryMulticastIpFinder();
ipFinder.setAddresses(Collections.singletonList(""));
discovery.setIpFinder(ipFinder);
cfg.setDiscoverySpi(discovery);
//cfg.setPeerClassLoadingEnabled(true);
cfg.setCacheConfiguration(cacheOutputReportCache());
return cfg;
}
//Configuration for cache "OutputReportCache".
public static CacheConfiguration<Long, OutputReport> cacheOutputReportCache() throws Exception {
CacheConfiguration<Long, OutputReport> ccfg = new CacheConfiguration<>();
ccfg.setName("OutputReportCache");
ccfg.setCacheMode(CacheMode.PARTITIONED);
ccfg.setAtomicityMode(CacheAtomicityMode.ATOMIC);
CacheJdbcPojoStoreFactory<Long, OutputReport> cacheStoreFactory = new CacheJdbcPojoStoreFactory<>();
cacheStoreFactory.setDataSourceFactory(new Factory<DataSource>() {
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
public DataSource create() {
return DataSources.dataSource;
};
});
cacheStoreFactory.setDialect(new OracleDialect());
ccfg.setCacheStoreFactory(cacheStoreFactory);
ccfg.setReadThrough(true);
ccfg.setWriteThrough(true);
ArrayList<QueryEntity> qryEntities = new ArrayList<>();
QueryEntity qryEntity = new QueryEntity();
qryEntity.setKeyType(String.class.getName());
qryEntity.setValueType(OutputReport.class.getName());
LinkedHashMap<String, String> fields = new LinkedHashMap<>();
fields.put("sid", "java.lang.String");
fields.put("sName", "java.lang.String");
fields.put("cname", "java.lang.String");
fields.put("cnumber", "java.lang.String");
fields.put("cname", "java.lang.String");
fields.put("cid", "java.lang.String");
fields.put("r", "java.lang.String");
fields.put("b", "java.lang.String");
fields.put("Date", "java.lang.String");
fields.put("Side", "java.lang.String");
fields.put("Quant", "java.lang.Float");
fields.put("price", "java.lang.Float");
fields.put("local", "java.lang.Float");
fields.put("usd", "java.lang.Float");
fields.put("trcy", "java.lang.String");
fields.put("Count", "java.lang.Integer");
fields.put("Type", "java.lang.String");
fields.put("Category", "java.lang.String");
fields.put("Subcategory", "java.lang.String");
fields.put("Country", "java.lang.String");
fields.put("eCountry", "java.lang.String");
fields.put("Desc", "java.lang.String");
fields.put("Sector", "java.lang.String");
fields.put("isector", "java.lang.String");
fields.put("Flag", "java.lang.String");
fields.put("Region", "java.lang.String");
fields.put("rowNum", "java.lang.Long");
qryEntity.setFields(fields);
// Listing indexes.
Collection<QueryIndex> indexes = new ArrayList<>(3);
indexes.add(new QueryIndex("sid"));
indexes.add(new QueryIndex("Region"));
indexes.add(new QueryIndex("cnumber"));
indexes.add(new QueryIndex("eCountry"));
qryEntity.setIndexes(indexes);
qryEntities.add(qryEntity);
ccfg.setQueryEntities(qryEntities);
return ccfg;
}
}
OutputReportStore.java：
public class OutputReportStore implements CacheStore<Long, OutputReport> {
//@SpringResource(resourceName = "dataSource")
private DataSource dataSource = DataSources.dataSource;
// This method is called whenever IgniteCache.loadCache() method is called.
@Override
public void loadCache(IgniteBiInClosure<Long, OutputReport> clo, @Nullable Object... objects) throws CacheLoaderException {
System.out.println(">> Loading cache from store...");
try (Connection conn = dataSource.getConnection()) {
try (PreparedStatement st = conn.prepareStatement("select * from OUTPUTREPORT")) {
try (ResultSet rs = st.executeQuery()) {
while (rs.next()) {
OutputReport outputreport = new OutputReport(rs.getString(1), rs.getString(2), rs.getString(3), rs.getString(4), rs.getString(5), rs.getString(6), rs.getString(7), rs.getString(8), rs.getString(9), rs.getString(10), rs.getFloat(11), rs.getFloat(12), rs.getFloat(13), rs.getFloat(14), rs.getString(15), rs.getInt(16), rs.getString(17), rs.getString(18), rs.getString(19), rs.getString(20), rs.getString(21), rs.getString(22), rs.getString(23), rs.getString(24), rs.getString(25), rs.getString(26), rs.getLong(27));
clo.apply(outputreport.getrowNum(), outputreport);
}
}
}
}
catch (SQLException e) {
throw new CacheLoaderException("Failed to load values from cache store.", e);
}
}
// Other CacheStore method implementations.
@Override
public OutputReport load(Long arg0) throws CacheLoaderException {
// TODO Auto-generated method stub
return null;
}
@Override
public void delete(Object arg0) throws CacheWriterException {
// TODO Auto-generated method stub
}
@Override
public void write(Entry<? extends Long, ? extends OutputReport> arg0)
throws CacheWriterException {
// TODO Auto-generated method stub
}
@Override
public Map<Long, OutputReport> loadAll(Iterable<? extends Long> arg0)
throws CacheLoaderException {
// TODO Auto-generated method stub
return null;
}
@Override
public void deleteAll(Collection<?> arg0) throws CacheWriterException {
// TODO Auto-generated method stub
}
@Override
public void writeAll(
Collection<Entry<? extends Long, ? extends OutputReport>> arg0)
throws CacheWriterException {
// TODO Auto-generated method stub
}
@Override
public void sessionEnd(boolean arg0) throws CacheWriterException {
// TODO Auto-generated method stub
}
}
LoadCaches.java：
public class LoadCaches {
//Load caches from database.
//1. Start cluster
//2. Start this utility and wait while load complete
public static void main(String[] args) throws Exception {
try (Ignite ignite = Ignition.start(Configuration.createConfiguration())) {
System.out.println(">>> Loading cache: OutputReportCache");
IgniteCache<Long, OutputReport> cache = ignite.getOrCreateCache("OutputReportCache");
cache.loadCache(null);
System.out.println(">>> Cache loaded!");
QueryCursor<List<?>> cursor = cache.query(new SqlFieldsQuery("select count(*) from outputreport"));
System.out.println(cursor.getAll());
}
}
}
这是堆栈跟踪：
[16:59:22] Ignite节点启动正常（id = 90c9464d，实例名称= Reports） [16:59:22]拓扑快照[ver = 29，服务器= 1，客户端= 6，CPU = 12， offheap = 90.0GB，heap = 36.0GB] [16:59:22] ^-节点 [id = 90C9464D-A48A-4DB7-8812-65CE5FD4B8FD，clusterState = ACTIVE]
加载缓存：OutputReportCache 缓存已加载！线程“主”中的异常javax.cache.CacheException：无法解析查询。表 找不到“ OUTPUTREPORT”； SQL语句：从中选择count（） 输出报告[42102-196]在 org.apache.ignite.internal.processors.cache.IgniteCacheProxyImpl.query（IgniteCacheProxyImpl.java:676） 在 org.apache.ignite.internal.processors.cache.IgniteCacheProxyImpl.query（IgniteCacheProxyImpl.java:615） 在 org.apache.ignite.internal.processors.cache.GatewayProtectedCacheProxy.query（GatewayProtectedCacheProxy.java:356） 在project4.LoadCaches.main（LoadCaches.java:26）造成原因：类 org.apache.ignite.internal.processors.query.IgniteSQLException：失败 解析查询。找不到表格“ OUTPUTREPORT”； SQL语句：选择 来自outputreport [42102-196]的count（） org.apache.ignite.internal.processors.query.h2.IgniteH2Indexing.prepareStatementAndCaches（IgniteH2Indexing.java:2026） 在 org.apache.ignite.internal.processors.query.h2.IgniteH2Indexing.parseAndSplit（IgniteH2Indexing.java:1796） 在 org.apache.ignite.internal.processors.query.h2.IgniteH2Indexing.querySqlFields（IgniteH2Indexing.java:1652） 在 org.apache.ignite.internal.processors.query.GridQueryProcessor $ 4.applyx（GridQueryProcessor.java:2035） 在 org.apache.ignite.internal.processors.query.GridQueryProcessor $ 4.applyx（GridQueryProcessor.java:2030） 在 org.apache.ignite.internal.util.lang.IgniteOutClosureX.apply（IgniteOutClosureX.java:36） 在 org.apache.ignite.internal.processors.query.GridQueryProcessor.executeQuery（GridQueryProcessor.java:2578） 在 org.apache.ignite.internal.processors.query.GridQueryProcessor.querySqlFields（GridQueryProcessor.java:2044） 在 org.apache.ignite.internal.processors.cache.IgniteCacheProxyImpl.query（IgniteCacheProxyImpl.java:664） ... 3更多原因：org.h2.jdbc.JdbcSQLException：表 找不到“ OUTPUTREPORT”； SQL语句：从中选择count（*） 输出报告[42102-196]在 org.h2.message.DbException.getJdbcSQLException（DbException.java:345） 在org.h2.message.DbException.get（DbException.java:179）处 org.h2.message.DbException.get（DbException.java:155）在 org.h2.command.Parser.readTableOrView（Parser.java:5552）在 org.h2.command.Parser.readTableFilter（Parser.java:1266）在 org.h2.command.Parser.parseSelectSimpleFromPart（Parser.java:1946）在 org.h2.command.Parser.parseSelectSimple（Parser.java:2095）在 org.h2.command.Parser.parseSelectSub（Parser.java:1940）在 org.h2.command.Parser.parseSelectUnion（Parser.java:1755）在 org.h2.command.Parser.parseSelect（Parser.java:1743）在 org.h2.command.Parser.parsePrepared（Parser.java:449）在 org.h2.command.Parser.parse（Parser.java:321）在 org.h2.command.Parser.parse（Parser.java:293）位于 org.h2.command.Parser.prepareCommand（Parser.java:258）位于 org.h2.engine.Session.prepareLocal（Session.java:578）在 org.h2.engine.Session.prepareCommand（Session.java:519）在 org.h2.jdbc.JdbcConnection.prepareCommand（JdbcConnection.java:1204） 在 org.h2.jdbc.JdbcPreparedStatement。（JdbcPreparedStatement.java:73） 在 org.h2.jdbc.JdbcConnection.prepareStatement（JdbcConnection.java:288） 在 org.apache.ignite.internal.processors.query.h2.IgniteH2Indexing.prepare0（IgniteH2Indexing.java:484） 在 org.apache.ignite.internal.processors.query.h2.IgniteH2Indexing.prepareStatement（IgniteH2Indexing.java:452） 在 org.apache.ignite.internal.processors.query.h2.IgniteH2Indexing.prepareStatement（IgniteH2Indexing.java:419） 在 org.apache.ignite.internal.processors.query.h2.IgniteH2Indexing.prepareStatementAndCaches（IgniteH2Indexing.java:2008） ...还有11个
如何解决？
答案 0 :(得分：2)
我想，NullPointerException异常的根本原因是CacheJdbcPojoStoreFactory#types没有在您的代码中定义。可以通过Java API完成，如下所示：
JdbcType storeType = new JdbcType;
storeType.setDatabaseSchema("Your-custom-schema");
storeType.setDatabaseTable("Table-name");
storeType.setKeyType(Long.class);
storeType.setValueType(OutputReport.class);
storeType.setValueFields(new JdbcTypeField(Types.VARCHAR, "sName", String.class, null));
...
cacheStoreFactory.setTypes(storeType);
您可以在此处找到示例：CacheJdbcPojoStoreTest