java.lang.ArithmeticException: Non-terminating decimal expansion; no exact representable decimal result. 错误解决

根据生产日志发现下面的错误：

java.lang.ArithmeticException: Non-terminating decimal expansion; no exact representable decimal result.
at java.math.BigDecimal.divide(BigDecimal.java:1603)
at com.ibm.scm.supplier.evaluation.biz.impl.BackEvaluateTaskReportServiceImpl.exportHQSummaryResult(BackEvaluateTaskReportServiceImpl.java:1103)
at com.ibm.scm.supplier.evaluation.biz.impl.SummaryScoreServiceImpl.exportHQSummaryResult(SummaryScoreServiceImpl.java:1540)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at com.sun.proxy.$Proxy3202.exportHQSummaryResult(Unknown Source)
at com.ibm.scm.supplier.evaluation.rss.impl.SummaryScoreRest.exportHQSummaryResult(SummaryScoreRest.java:685)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)

然后定位代码：

if (h != 0) {
reduceScore = totalReduceScore.divide(new BigDecimal(h));
}

问题原因：

　　用BigDecimal做除法的时候一定要在divide方法中传递第二个参数，定义精确到小数点后几位，否则在不整除的情况下，结果是无限循环小数时，就会抛出以上异常。

解决办法：

　　做除法的时候指定保留的小数的位数

　　将源代码改为：

　　reduceScore = totalReduceScore.divide(new BigDecimal(h), 6, BigDecimal.ROUND_HALF_UP);

 

　　BigDecimal 有两个重载方法：

　　public BigDecimal divide(BigDecimal divisor, int scale, int roundingMode)  // 传入除数 , 精度，round的模式

　　public BigDecimal divide(BigDecimal divisor, RoundingMode roundingMode)  // 传入除数, round的模式