运行测试类testGenerateId方法java.lang.ArithmeticException: Division by zero

[wuzhenwei0419]

`java.lang.ArithmeticException: Division by zero

at java.math.BigDecimal.divide(BigDecimal.java:1742)
at java.math.BigDecimal.divideToIntegralValue(BigDecimal.java:1792)
at java.math.BigDecimal.divideAndRemainder(BigDecimal.java:1948)
at com.snowalker.shardingjdbc.snowalker.demo.complex.sharding.util.StringUtil.getDbIndexByMod(StringUtil.java:103)
at com.snowalker.shardingjdbc.snowalker.demo.complex.sharding.sequence.KeyGenerator.getDbIndexAndTbIndexMap(KeyGenerator.java:82)
at com.snowalker.shardingjdbc.snowalker.demo.complex.sharding.sequence.KeyGenerator.generateKey(KeyGenerator.java:51)
at com.snowalker.shardingjdbc.snowalker.demo.SnowalkerShardingjdbcDemoApplicationTests.testGenerateId(SnowalkerShardingjdbcDemoApplicationTests.java:87)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)`

错误断点
public static long getDbIndexByMod(Object obj,int dbCount,int tbCount) { long tbRange = getModValue(obj, tbCount); BigDecimal bc = new BigDecimal(tbRange); // ==这个位置dbCount/tbCount--> 4/16=0 BigDecimal[] results = bc.divideAndRemainder(new BigDecimal(dbCount/tbCount)); return (long)results[0].intValue(); }