java - Unix: Delete File code giving some process -
i have coded java code delete file particular path. able see process running using below command , find 1 entry.
root@ad4d # ps -ef | grep del root 27896 27895 0 jun 24 pts/5 0:49 java -jar /oracle/php/online/jars/dist/delfile.jar but when administrator checks process running command below can see many child threads , parent thread process below
root@almt4d # ps -aadeflcjlpyz | grep del s global root 27896 27895 26891 26891 1 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 2 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 3 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 4 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 5 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 6 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 7 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 8 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 9 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 10 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 11 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 12 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 13 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 14 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 15 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 16 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 17 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 18 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 19 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 20 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 21 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 22 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 23 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 24 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 25 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 26 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 27 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 28 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 29 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 30 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 31 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 32 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 33 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 34 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 35 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 36 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 37 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 38 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 39 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 40 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 41 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 42 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 43 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 44 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 45 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 46 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 47 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 48 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 49 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 50 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 51 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 52 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 53 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 54 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 55 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 56 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 57 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 58 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 59 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 60 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 61 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 62 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 63 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 64 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 65 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 66 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 67 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 68 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 69 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 70 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 71 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 72 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 73 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 74 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 75 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 76 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 77 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 78 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 79 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 80 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 81 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 82 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 83 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 84 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 85 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 86 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 87 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 88 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:04 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 89 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 90 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 91 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 92 - 96 ts 58 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 93 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 94 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 95 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:45 java -jar /oracle/php/online/jars/d s global root 27896 27895 26891 26891 96 - 96 ts 59 37144 116392 ? jun 24 pts/5 0:00 java -jar /oracle/php/online/jars/d can please explain these kind of child , parent thread process started executing. have executed 1 delfile.java has 1 thread there anyway control child threads visible administrator using below command
root@almt4d # ps -aadeflcjlpyz | grep del delfile.java
package delfile; import java.io.file; import java.io.ioexception; import java.util.date; import org.apache.log4j.fileappender; import org.apache.log4j.logger; import org.apache.log4j.patternlayout; import org.apache.log4j.simplelayout; public class delfile extends thread{ static logger log =logger.getlogger(delfile.class); fileappender app = null; public delfile()throws ioexception{ app = new fileappender(new simplelayout(), "/oracle/php/online/jars/dist/del_file.log"); } public void logset(){ app.setlayout(new patternlayout(("%d{yyyy-mm-dd hh:mm:ss} %-5.5p [%t] %m%n"))); log.addappender(app); } boolean flage=true; public void run(){ while(flage){ final string str="xls"; string add="/oracle/php/online/jars/dist/"; string[] paths; file f = null; try{ f = new file(add); paths=f.list(); for(string path:paths) { string temp=""; string temp1=""; int count=0; for(int i=path.length()-1;i>=0;i--){ if(path.charat(i)!='.'){ count++; temp+=path.charat(i);//pmbs }else{ for(int j=temp.length()-1;j>=0;j--){ temp1+=temp.charat(j); } if(str.length()==count){ break; } } } if(str.equals(temp1)){ long time= new file(add+path).lastmodified(); long utime=time+600000l; while(utime>system.currenttimemillis()){ thread.sleep(601000); } logset(); log.info(path +" : file deleted"); new file(add+path).delete(); } } }catch(nullpointerexception np){ try{ thread.sleep(600000); }catch(interruptedexception ip) {} }catch(interruptedexception ie){ } } } public static void main(string[] args)throws ioexception{ delfile r=new delfile(); r.start(); } }
boolean flage=true; public void run(){ while(flage){ // flage not referenced below, no break, no return ... } this called endless loop. causes thread run ever, explains many entries seen ps.
later
the lwps (or threads) see jvm internal threads - not threads created program. thought worried why they'd remain in machine, apparently ever, indeed due endless loop: program doesn't terminate after files gone.
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