When the instances of String in the constant pool is GC'ed?

Hi all

I am involved in the development of the application; where we save many string objects in several HashMaps. Because the string created/places in HashMap objects may have duplicate values; We call the String method: intern() to make use of the pool of characteristic string constant in Java. But my concern is - instance when the constant string will be removed from the Pool? Is it follow the same behavior if no references are presentm, it is eligible for GC; i.e., removal of an instance of the HashMaps?

Help, please.

Thank you and best regards,
R Kaja abdenour

An internal String can be reclaimed by garbage collection. It seems that you should use a WeakHashMap. That does not sound references to key chains at all, regardless of whether or not they were interned.

Tags: Java

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10 GENTYPES = > FALSE,
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15 END;
16.
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6 var_xml: =.
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9 result: =.
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ROWNUM
----------
OBJECT_VALUE
----------------------------------------------------------------------------------
1
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2 var_xml XMLTYPE.
3 url_schema VARCHAR2 (50): = ' http://www.ms.eta.lu/sante/vol_reel.xsd';
4 BEGIN
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6 IF (var_xml.isSchemaValid (url_schema, 'vol_reel') = 0) THEN
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9 dbms_output.put_line ("' valid document");
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11 END;
12.
DECLARE
*
ERROR O line 1:
ORA-31038: invalid number value: "95.5".
ORA-06512: O 'SYS. XMLTYPE", line 369
ORA-06512: O line 6

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  1  SELECT xplan.*
  2  FROM
  3     (
  4     select max(sql_id) keep
  5            (dense_rank last order by last_active_time) sql_id
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old   9:         where upper(sql_text) like '%&1%'
new   9:         where upper(sql_text) like '%Oracle%'

PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------
SQL_ID  6k3tn5dr0k17v, child number 0
-------------------------------------
SELECT xplan.* FROM  (  select max(sql_id) keep         (dense_rank
last order by last_active_time) sql_id       , max(child_number) keep
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'ALLSTATS LAST')) xplan

Plan hash value: 2794990177

------------------------------------------------------------------------------------------------------------------
| Id  | Operation                          | Name              | Starts | E-Rows | A-Rows |   A-Time   | Buffers |
------------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT                   |                   |      1 |        |     13 |00:00:00.05 |       4 |
|   1 |  NESTED LOOPS                      |                   |      1 |   8168 |     13 |00:00:00.05 |       4 |
|   2 |   VIEW                             |                   |      1 |      1 |      1 |00:00:00.01 |       0 |
|   3 |    SORT AGGREGATE                  |                   |      1 |      1 |      1 |00:00:00.01 |       0 |
|*  4 |     FIXED TABLE FULL               | X$KGLCURSOR_CHILD |      1 |      1 |      0 |00:00:00.01 |       0 |
|   5 |   COLLECTION ITERATOR PICKLER FETCH| DISPLAY_CURSOR    |      1 |   8168 |     13 |00:00:00.04 |       4 |
------------------------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   4 - filter((UPPER("KGLNAOBJ") LIKE '%Oracle%' AND UPPER("KGLNAOBJ") NOT LIKE '%FROM V$SQL WHERE
              UPPER(SQL_TEXT) LIKE %' AND "INST_ID"=USERENV('INSTANCE')))


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