TeslaCN commented on issue #19607:
URL:
https://github.com/apache/shardingsphere/issues/19607#issuecomment-1198889062
I've reproduced this issue.
```
[INFO ] 2022-07-29 13:15:56,294 --main--
[com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource] Initializing c3p0
pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 3,
acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose ->
false, automaticTestTable -> null, breakAfterAcquireFailure -> false,
checkoutTimeout -> 0, connectionCustomizerClassName -> null,
connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester,
contextClassLoaderSource -> caller, dataSourceName ->
z8kfsxaqk30d5911hdcsh|47d9a273, debugUnreturnedConnectionStackTraces -> false,
description -> null, driverClass -> null, extensions -> {},
factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false,
forceSynchronousCheckins -> false, forceUseNamedDriverClass -> false,
identityToken -> z8kfsxaqk30d5911hdcsh|47d9a273, idleConnectionTestPeriod -> 0,
initialPoolSize -> 3, jdbcUrl ->
jdbc:mysql://localhost:3306/demo_ds_1?serverTimezone=UTC&useSSL=false
&useUnicode=true&characterEncoding=UTF-8&allowPublicKeyRetrieval=true,
maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 0,
maxIdleTimeExcessConnections -> 0, maxPoolSize -> 15, maxStatements -> 0,
maxStatementsPerConnection -> 0, minPoolSize -> 3, numHelperThreads -> 3,
preferredTestQuery -> null, privilegeSpawnedThreads -> false, properties ->
{password=******, user=******}, propertyCycle -> 0,
statementCacheNumDeferredCloseThreads -> 0, testConnectionOnCheckin -> false,
testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0,
userOverrides -> {}, usesTraditionalReflectiveProxies -> false ]
[INFO ] 2022-07-29 13:15:56,319 --main--
[com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource] Initializing c3p0
pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 3,
acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose ->
false, automaticTestTable -> null, breakAfterAcquireFailure -> false,
checkoutTimeout -> 0, connectionCustomizerClassName -> null,
connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester,
contextClassLoaderSource -> caller, dataSourceName ->
z8kfsxaqk30d5911hdcsh|68dc098b, debugUnreturnedConnectionStackTraces -> false,
description -> null, driverClass -> null, extensions -> {},
factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false,
forceSynchronousCheckins -> false, forceUseNamedDriverClass -> false,
identityToken -> z8kfsxaqk30d5911hdcsh|68dc098b, idleConnectionTestPeriod -> 0,
initialPoolSize -> 3, jdbcUrl ->
jdbc:mysql://localhost:3306/demo_ds_0?serverTimezone=UTC&useSSL=false
&useUnicode=true&characterEncoding=UTF-8&allowPublicKeyRetrieval=true,
maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 0,
maxIdleTimeExcessConnections -> 0, maxPoolSize -> 15, maxStatements -> 0,
maxStatementsPerConnection -> 0, minPoolSize -> 3, numHelperThreads -> 3,
preferredTestQuery -> null, privilegeSpawnedThreads -> false, properties ->
{password=******, user=******}, propertyCycle -> 0,
statementCacheNumDeferredCloseThreads -> 0, testConnectionOnCheckin -> false,
testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0,
userOverrides -> {}, usesTraditionalReflectiveProxies -> false ]
Exception in thread "main" java.lang.NullPointerException: Cannot invoke
"Object.toString()" because the return value of "java.util.Map.get(Object)" is
null
at
org.apache.shardingsphere.infra.metadata.database.resource.ShardingSphereResource.createDataSourceMetaDataMap(ShardingSphereResource.java:63)
at
org.apache.shardingsphere.infra.metadata.database.resource.ShardingSphereResource.<init>(ShardingSphereResource.java:52)
at
org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase.createResource(ShardingSphereDatabase.java:115)
at
org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase.create(ShardingSphereDatabase.java:109)
at
org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase.create(ShardingSphereDatabase.java:91)
at
org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabasesFactory.createGenericDatabases(ShardingSphereDatabasesFactory.java:80)
at
org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabasesFactory.create(ShardingSphereDatabasesFactory.java:68)
at
org.apache.shardingsphere.mode.metadata.MetaDataContextsFactory.create(MetaDataContextsFactory.java:66)
at
org.apache.shardingsphere.mode.manager.standalone.StandaloneContextManagerBuilder.build(StandaloneContextManagerBuilder.java:51)
at
org.apache.shardingsphere.driver.jdbc.core.datasource.ShardingSphereDataSource.createContextManager(ShardingSphereDataSource.java:74)
at
org.apache.shardingsphere.driver.jdbc.core.datasource.ShardingSphereDataSource.<init>(ShardingSphereDataSource.java:64)
at
org.apache.shardingsphere.driver.api.ShardingSphereDataSourceFactory.createDataSource(ShardingSphereDataSourceFactory.java:93)
at
org.apache.shardingsphere.driver.api.yaml.YamlShardingSphereDataSourceFactory.createDataSource(YamlShardingSphereDataSourceFactory.java:133)
at
org.apache.shardingsphere.driver.api.yaml.YamlShardingSphereDataSourceFactory.createDataSource(YamlShardingSphereDataSourceFactory.java:62)
at
org.apache.shardingsphere.example.sharding.raw.jdbc.factory.YamlDataSourceFactory.newInstance(YamlDataSourceFactory.java:33)
at
org.apache.shardingsphere.example.sharding.raw.jdbc.ShardingRawYamlConfigurationExample.main(ShardingRawYamlConfigurationExample.java:41)
```
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