linghengqian edited a comment on issue #13120:
URL:
https://github.com/apache/shardingsphere/issues/13120#issuecomment-946397674
> If you start with , the proxy will use the saved configuration on , so you
can change to and try again. But the key is to confirm the configuration saved
on .`zk``zk``overwrite``true``zk`
After changing the overwrite attribute("overwrite: true"), the error changed
to another kind. I found that I omitted an attribute and did not configure it.
Thank you for your help. This is a configuration issue.
```shell
[INFO ] 2021-10-19 14:06:30.328 [main] o.apache.curator.utils.Compatibility
- Using org.apache.zookeeper.server.quorum.MultipleAddresses
Exception in thread "main" java.lang.NullPointerException: The
props`strategy` cannot be null when uses class based sharding strategy.
at
com.google.common.base.Preconditions.checkNotNull(Preconditions.java:987)
at
org.apache.shardingsphere.sharding.algorithm.sharding.classbased.ClassBasedShardingAlgorithm.init(ClassBasedShardingAlgorithm.java:62)
at
org.apache.shardingsphere.infra.config.algorithm.ShardingSphereAlgorithmFactory.createAlgorithm(ShardingSphereAlgorithmFactory.java:43)
at
org.apache.shardingsphere.sharding.rule.ShardingRule.lambda$new$0(ShardingRule.java:104)
at java.util.LinkedHashMap.forEach(LinkedHashMap.java:684)
at
org.apache.shardingsphere.sharding.rule.ShardingRule.<init>(ShardingRule.java:104)
at
org.apache.shardingsphere.sharding.rule.builder.ShardingRuleBuilder.build(ShardingRuleBuilder.java:37)
at
org.apache.shardingsphere.sharding.rule.builder.ShardingRuleBuilder.build(ShardingRuleBuilder.java:33)
at
org.apache.shardingsphere.infra.rule.builder.ShardingSphereRulesBuilder.lambda$buildSchemaRules$0(ShardingSphereRulesBuilder.java:66)
at
java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at java.util.Iterator.forEachRemaining(Iterator.java:116)
at
java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
at
java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
at
java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
at
java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
at
java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at
java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:566)
at
org.apache.shardingsphere.infra.rule.builder.ShardingSphereRulesBuilder.buildSchemaRules(ShardingSphereRulesBuilder.java:66)
at
org.apache.shardingsphere.infra.context.metadata.MetaDataContextsBuilder.buildMetaData(MetaDataContextsBuilder.java:99)
at
org.apache.shardingsphere.infra.context.metadata.MetaDataContextsBuilder.build(MetaDataContextsBuilder.java:90)
at
org.apache.shardingsphere.proxy.initializer.impl.AbstractBootstrapInitializer.createMetaDataContexts(AbstractBootstrapInitializer.java:84)
at
org.apache.shardingsphere.proxy.initializer.impl.AbstractBootstrapInitializer.init(AbstractBootstrapInitializer.java:67)
at org.apache.shardingsphere.proxy.Bootstrap.main(Bootstrap.java:48)
```
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