记录一次线上OOM

发现服务宕机两次，于是查看日志，发现错误如下：

　　原因：

datab 15:46:59.302 [SimpleAsyncTaskExecutor-7] ERROR o.s.a.i.SimpleAsyncUncaughtExceptionHandler
                - Unexpected error occurred invoking async method 'public void com.chinadatab.job.ScheduledTasks.lucene_enterprise()'.
java.lang.StackOverflowError: null
    at sun.nio.fs.WindowsNativeDispatcher.CreateFile0(Native Method)
    at sun.nio.fs.WindowsNativeDispatcher.CreateFile(Unknown Source)
    at sun.nio.fs.WindowsChannelFactory.open(Unknown Source)
    at sun.nio.fs.WindowsChannelFactory.newFileChannel(Unknown Source)
    at sun.nio.fs.WindowsFileSystemProvider.newByteChannel(Unknown Source)
    at java.nio.file.Files.newByteChannel(Unknown Source)
    at java.nio.file.Files.createFile(Unknown Source)
    at org.apache.lucene.store.NativeFSLockFactory.obtainFSLock(NativeFSLockFactory.java:98)
    at org.apache.lucene.store.FSLockFactory.obtainLock(FSLockFactory.java:41)
    at org.apache.lucene.store.BaseDirectory.obtainLock(BaseDirectory.java:45)
    at org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:727)
    at com.chinadatab.lucene.LuceneManage._IndexWriter(LuceneManage.java:934)
    at com.chinadatab.lucene.LuceneManage._IndexWriter(LuceneManage.java:940)

　　从日志中可以看出是那个方法导致的OOM，这里是栈溢出，于是找到对应的语句查看，有一个定时器，每隔30分钟执行一次，每次查询取了10000条数据，处理完10000完数据后批量通过indexWrite生成索引导致的，如下：

@Async
@Scheduled(initialDelay=1000*60*30, fixedDelay=1000*60*30)
/**
 * 完善基础企业库
*/
public void lucene_enterprise(){ 
     
     String tableName="company";
        LuceneManage luceneManage= LuceneManage.getInstance();
        Page page = luceneManage.get(0, 1, true, tableName);
        List<Map<String, Object>> lists = page.getList();
        long id=0;
        for (Map<String, Object> map : lists) {
            id=Long.parseLong(map.get("id").toString());
        }       
        if(id>0)
        {
            TngouDBHelp TngouDBHelp  = new TngouDBHelp();
            List<Enterprise> list;
            try {　　//这里取了10000条数据，导致了OOM
                list = mapper.serach(id);
                if(list==null||list.isEmpty()) {
                    return;
                }
                List<Fields> ls= new ArrayList<>();<br>　　　　　　　　　　　　　　　　　　　　　　　　　　　　　//创建了大量对象
                for (Enterprise e : list) {
                    Fields fields = new Fields();
                    fields.add(new Field("id", e.getId()+"", Type.Key));
                    fields.add(new Field("person", e.getOper_name(), Type.Text));
                    fields.add(new Field("name", e.getName(), Type.Text));
                    fields.add(new Field("address", e.getAddress(), Type.Text));
                    ls.add(fields);
                             
                };
                TngouDBHelp.insert(tableName,ls);
            } catch (Exception e1) {
                e1.printStackTrace();
            }
             
        }
     
}