小编Eli*_*ana的帖子

我正在使用JPA 2.1（Eclipselink供应商）@SqlResultSetMapping将sql查询映射到none实体POJO，当sql结果不为空但my表为空时，它可以工作

我的POJO的构建失败，但有以下例外：

 2016-05-30 11:44:17,154 [tp520017379-230] ERROR - Exception [EclipseLink-6177] (Eclipse Persistence Services - 2.6.2.v20151217-774c696): org.eclipse.persistence.exceptions.QueryException
    Exception Description: The column result [st_agg] was not found in the results of the query.
    Query: ResultSetMappingQuery(name="nodeStatusAggQuery" sql="select max(status) as st_agg, max(clock_accuracy_health) as cac_agg, max(clock_analysis_health) as can_agg, max(ptp_net_analysis_health) as na_agg from sync_node where ncd_id = ? and type =?")
    javax.persistence.PersistenceException: Exception [EclipseLink-6177] (Eclipse Persistence Services - 2.6.2.v20151217-774c696): org.eclipse.persistence.exceptions.QueryException
    Exception Description: The column result [st_agg] was not found in the results of the query. …

我正在使用 Spring Boot 2.2.5 并通过 Spring Boot Actuator 和 Grafana 监控我的应用程序指标。

我的应用程序是用Docker（OpenJdk11）打包的，并配置了4GB内存

我的 gc 暂停时间很长，大约需要 1-2 秒，并且它与高jvm.gc.memory.allocated相关。

jvm.gc.memory.allocated 指标有时会达到30GB

谁能解释jvm.gc.memory.alulated指标？这是什么意思 ？