Log4j, appender and InstantiationException

Hi,
I have written my own appender in an Eclipse project that uses log4j. When I try to use the appender I get the following exception:
log4j:ERROR Could not instantiate class [test.appender.NewFileAppender].
java.lang.InstantiationException: test.appender.NewFileAppender
     at java.lang.Class.newInstance0(Unknown Source)
     at java.lang.Class.newInstance(Unknown Source)
     at org.apache.log4j.helpers.OptionConverter.instantiateByClassName(OptionConverter.java:329)
     at org.apache.log4j.helpers.OptionConverter.instantiateByKey(OptionConverter.java:120)
     at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:629)
     at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:612)
     at org.apache.log4j.PropertyConfigurator.parseCatsAndRenderers(PropertyConfigurator.java:533)
     at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:417)
     at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:316)
     at org.apache.log4j.PropertyWatchdog.doOnChange(PropertyConfigurator.java:682)
     at org.apache.log4j.helpers.FileWatchdog.checkAndConfigure(FileWatchdog.java:88)
     at org.apache.log4j.helpers.FileWatchdog.<init>(FileWatchdog.java:57)
     at org.apache.log4j.PropertyWatchdog.<init>(PropertyConfigurator.java:674)
     at org.apache.log4j.PropertyConfigurator.configureAndWatch(PropertyConfigurator.java:382)
     at se.micronic.argos.main.Main.initLogging(Main.java:305)
     at se.micronic.argos.main.Main.<init>(Main.java:272)
     at se.micronic.argos.main.Main.main(Main.java:1339)
log4j:ERROR Could not instantiate appender named "argos".My property file looks like this:
log4j.appender.argos=test.appender.NewFileAppender
log4j.appender.argos.file=logs/MArgos.logThe other appenders in the property file work fine.
Any ideas?
Thanks
Markus

could be you don't have a no-args constructor? show us the NewFileAppender class
is that the entire stack trace? there's no other underlying exception being thrown?

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Hi,
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Thank you very much

You're so over-sensitive you: when an OP doesn't respond anymore
to your last reply it implies that you've solved the problem and
(implicitly) that the OP is very grateful to you. Why do you always
have to be so explicit about matters? ;-)
Because I'm not one of those Dutch people ;-)Yes, that's us, the Dutch: mysteriously smiling and keeping silent all the
time. That's why they call us the Asians of Western Europe ;-)
ps. There are nice exception to the rule sometimes though.
Yes, and unfortunately they do seem to be the exception rather than
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and don't give a f*ck about the guy who supplied the information. It's sad
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Maybe we should start a support group where we could thank each
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After that is done, how can I actually write to the files? When logging I
was thinking just using: logger.info("log something").
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understand the technology first..then ask specific question here.
it will be useless just handling out answers to everyone. i think they're here just not to provides answers, but to educate other along the way...but they need to see an effort was made first.
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%m%n
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tell what appender to use...so include all your appender in this property.
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<root>
   <priority value="debug"/>
   <appender-ref ref="DEBUG"/>
   <appender-ref ref="INFO"/>
   <appender-ref ref="MY_APPENDER_NAME"/>
</root>
</log4j:Configuration>

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06/11/2014 22:22:03,507
QuickTime Player[1723]
postExceptionEvent caught non-fatal NSInvalidArgumentException '*** -[NSDictionary initWithObjects:forKeys:]: count of objects (0) differs from count of keys (4)' with backtrace (
0   CoreFoundation                      0x00007fff8ac6564c __exceptionPreprocess + 172
1   libobjc.A.dylib                     0x00007fff8924f6de objc_exception_throw + 43
2   CoreFoundation                      0x00007fff8ab98dcd -[NSDictionary initWithObjects:forKeys:] + 941
3   Foundation                          0x00007fff8a6a8bcc -[NSDictionary(NSDictionary) initWithCoder:] + 245
4   Foundation                          0x00007fff8a686150 _decodeObjectBinary + 2872
5   Foundation                          0x00007fff8a6854a6 _decodeObject + 278
6   Foundation                          0x00007fff8a6a9921 -[NSKeyedUnarchiver decodeObjectOfClasses:forKey:] + 173
7   Foundation                          0x00007fff8a75f2b4 -[NSError initWithCoder:] + 253
8   Foundation                          0x00007fff8a686150 _decodeObjectBinary + 2872
9   Foundation                          0x00007fff8a6854a6 _decodeObject + 278
10 Foundation                          0x00007fff8a6ab0c9 +[NSKeyedUnarchiver unarchiveObjectWithData:] + 89
11 QuickTime Player                    0x000000010dcd8253 QuickTime Player + 758355
12 QuickTime Player                    0x000000010dc8981f QuickTime Player + 436255
13 QuickTime Player                    0x000000010dc894fb QuickTime Player + 435451
14 QuickTime Player                    0x000000010dc6ce48 QuickTime Player + 319048
15 AppKit                              0x00007fff93c5d75a __85-[NSDocument runModalSavePanelForSaveOperation:delegate:didSaveSelector:contextInfo:]_block_ invoke1714 + 113
16 AppKit                              0x00007fff93c4efca -[NSDocument continueActivityUsingBlock:] + 323
17 AppKit                              0x00007fff93c5d5cb __85-[NSDocument runModalSavePanelForSaveOperation:delegate:didSaveSelector:contextInfo:]_block_ invoke_21706 + 458
18 AppKit                              0x00007fff93c5d0ec __85-[NSDocument runModalSavePanelForSaveOperation:delegate:didSaveSelector:contextInfo:]_block_ invoke1690 + 1365
19 AppKit                              0x00007fff940903b6 -[NSVBSavePanel didEndPanelWithReturnCode:] + 68
20 AppKit                              0x00007fff9409323d -[NSVBSavePanel didEndSheet:returnCode:contextInfo:] + 154
21 AppKit                              0x00007fff93f718d9 -[NSWindow _endWindowBlockingModalSession:returnCode:] + 315
22 AppKit                              0x00007fff9409307c -[NSVBSavePanel observeValueForKeyPath:ofObject:change:context:] + 560
23 Foundation                          0x00007fff8a677c73 NSKeyValueNotifyObserver + 382
24 Foundation                          0x00007fff8a676e48 NSKeyValueDidChange + 463
25 Foundation                          0x00007fff8a67b9ad -[NSObject(NSKeyValueObserverNotification) didChangeValueForKey:] + 118
26 ViewBridge                          0x00007fff959cbbd7 -[NSViewBridge nonLocalChangeInProgress:block:] + 382
27 ViewBridge                          0x00007fff95a15766 -[NSRemoteViewMarshal exceptionSafeSetRemoteObject:forKey:withReply:] + 275
28 ViewBridge                          0x00007fff95a158f1 -[NSRemoteViewMarshal setRemoteObject:forKey:withReply:] + 56
29 CoreFoundation                      0x00007fff8ab3e33c __invoking___ + 140
30 CoreFoundation                      0x00007fff8ab3e192 -[NSInvocation invoke] + 290
31 ViewBridge                          0x00007fff95a1bce3 __deferNSXPCInvocationOntoMainThread_block_invoke + 85
32 ViewBridge                          0x00007fff95a1b91e __deferBlockOntoMainThread_block_invoke_2 + 390
33 CoreFoundation                      0x00007fff8ab8354c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
34 CoreFoundation                      0x00007fff8ab75655 __CFRunLoopDoBlocks + 341
35 CoreFoundation                      0x00007fff8ab75196 __CFRunLoopRun + 1814
36 CoreFoundation                      0x00007fff8ab74838 CFRunLoopRunSpecific + 296
37 HIToolbox                           0x00007fff8cb6f43f RunCurrentEventLoopInMode + 235
38 HIToolbox                           0x00007fff8cb6f1ba ReceiveNextEventCommon + 431
39 HIToolbox                           0x00007fff8cb6effb _BlockUntilNextEventMatchingListInModeWithFilter + 71
40 AppKit                              0x00007fff9383b821 _DPSNextEvent + 964
41 AppKit                              0x00007fff9383afd0 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 194
42 AppKit                              0x00007fff9382ef73 -[NSApplication run] + 594
43 AppKit                              0x00007fff9381a424 NSApplicationMain + 1832
44 libdyld.dylib                       0x00007fff8ec845c9 start + 1
timestamp: 22:22:03.507 Thursday 06 November 2014
process/thread/queue: QuickTime Player (1723) / 0x7fff78cd0300 / com.apple.main-thread
code: line 844 of /SourceCache/ViewBridge/ViewBridge-99/ViewBridgeUtilities.m in logCaughtException
#exceptions
06/11/2014 22:22:03,525
com.apple.appkit.xpc.openAndSavePanelService[1748]
remote view failed to set bridge object {
    URL = "file:///Users/pascalgros/Documents/Videos%20Maurice%202013/Exports/M2U01020.m4 v";
    URLs =     (
        "file:///Users/pascalgros/Documents/Videos%20Maurice%202013/Exports/M2U01020.m4 v"
    index = 1;
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} for key most-recent-completion due to Error Domain=com.apple.ViewBridge Code=8 "L’opération n’a pas pu s’achever. (com.apple.ViewBridge erreur 8)." UserInfo=0x61000006ebc0 {com.apple.ViewBridge.error.hint=most-recent-completion, com.apple.ViewBridge.error.description=NSViewBridgeExceptionError}; service call stack was (
0   ViewBridge                          0x00007fff959e8b30 -[NSViewServiceMarshal setRemoteObject:forKey:] + 341
1   Foundation                          0x00007fff8a677c73 NSKeyValueNotifyObserver + 382
2   Foundation                          0x00007fff8a676e48 NSKeyValueDidChange + 463
3   Foundation                          0x00007fff8a67b9ad -[NSObject(NSKeyValueObserverNotification) didChangeValueForKey:] + 118
4   com.apple.appkit.xpc.openAndSavePanelService 0x000000010a661407 com.apple.appkit.xpc.openAndSavePanelService + 9223
5   AppKit                              0x00007fff93dead5a -[NSSavePanel _dismissModeless:] + 109
6   com.apple.appkit.xpc.openAndSavePanelService 0x000000010a66191c com.apple.appkit.xpc.openAndSavePanelService + 10524
7   AppKit                              0x00007fff93ded580 -[NSSavePanel ok:] + 449
8   com.apple.appkit.xpc.openAndSavePanelService 0x000000010a661952 com.apple.appkit.xpc.openAndSavePanelService + 10578
9   libsystem_trace.dylib               0x00007fff8d3ebcd7 _os_activity_initiate + 75
10 AppKit                              0x00007fff93a0a5e7 -[NSApplication sendAction:to:from:] + 410
11 AppKit                              0x00007fff93a0a410 -[NSControl sendAction:to:] + 86
12 AppKit                              0x00007fff93bdedaf __26-[NSCell _sendActionFrom:]_block_invoke + 131
13 libsystem_trace.dylib               0x00007fff8d3ebcd7 _os_activity_initiate + 75
14 AppKit                              0x00007fff93a52f2c -[NSCell _sendActionFrom:] + 144
15 AppKit                              0x00007fff93bc5ab2 -[NSButtonCell _sendActionFrom:] + 39
16 libsystem_trace.dylib               0x00007fff8d3ebcd7 _os_activity_initiate + 75
17 AppKit                              0x00007fff93a6da66 -[NSCell trackMouse:inRect:ofView:untilMouseUp:] + 2731
18 AppKit                              0x00007fff93a6ccc1 -[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] + 491
19 AppKit                              0x00007fff93a6c289 -[NSControl mouseDown:] + 714
20 AppKit                              0x00007fff93f65fef -[NSWindow _reallySendEvent:] + 12827
21 AppKit                              0x00007fff939f065c -[NSWindow sendEvent:] + 368
22 AppKit                              0x00007fff939a21e6 -[NSApplication sendEvent:] + 2238
23 ViewBridge                          0x00007fff959d18ab -[NSViewServiceApplication sendEventWithoutCatch:withForwarding:] + 652
24 ViewBridge                          0x00007fff959d1fbd -[NSViewServiceApplication sendEvent:withForwarding:] + 29
25 AppKit                              0x00007fff9382efe8 -[NSApplication run] + 711
26 AppKit                              0x00007fff9381a424 NSApplicationMain + 1832
27 libxpc.dylib                        0x00007fff88837ef2 _xpc_objc_main + 793
28 libxpc.dylib                        0x00007fff88839a9d _parse_sysctl_once + 0
29 ViewBridge                          0x00007fff95a20165 xpc_connection_handler + 0
30 ViewBridge                          0x00007fff959d4ff7 NSViewServiceApplicationMain + 1892
31 com.apple.appkit.xpc.openAndSavePanelService 0x000000010a665035 main + 208
32 libdyld.dylib                       0x00007fff8ec845c9 start + 1
33 ???                                 0x0000000000000001 0x0 + 1
timestamp: 22:22:03.525 Thursday 06 November 2014
process/thread/queue: com.apple.appkit.xpc.openAndSavePanelService (1748) / 0x7fff78cd0300 / com.apple.main-thread
code: line 3847 of /SourceCache/ViewBridge/ViewBridge-99/NSViewServiceMarshal.m in __47-[NSViewServiceMarshal setRemoteObject:forKey:]_block_invoke_2
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Hi,
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Integrates data in any SQL compliant target table in replace/append mode.
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IKM SQL to SQL Append :
Integrates data in a target SQL compliant table from any SQL compliant staging area in replace mode.
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MODIFY itab
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MODIFY { itab_line | itab_lines }.
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This statement changes the content of one or several itab_line or itab_lines lines that can be specified using the table key or the table index.
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sy-subrc Meaning
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4 No lines were changed, since no suitable line was found for the insertion using the table key, or the specified index was greater than the current number of lines for the insertion using the table index.
Note
Apart from using the MODIFY statement, the content of an individual table line can be changed using assignments to field symbols and dereferenced data references that point to the table line.
Exceptions
Non-Catchable Exceptions
Cause: Illegal dynamic specification of a line component
Runtime Error: ITAB_ILLEGAL_COMPONENT
Cause: Illegal key component in the TRANSPORTING list.
Runtime Error: ITAB_ILLEGAL_TRANSP_COMP
Syntax Diagram
APPEND
Syntax
APPEND line_spec TO itab [SORTED BY comp] [result].
Addition:
... SORTED BY comp
Effect
This statement appends one or more rows line_spec to an internal index table itab. If itab is a standard table, you can use SORTED BY to sort the table in a specified way. Use result when appending a single row as of release 6.10 to set a reference to the appended row in the form of a field symbol or a data reference.
For the individual table types, appending is done as follows:
To standard tables, rows are appended directly and without checking the content of the internal table.
To sorted tables, rows are appended only if they correspond to the sort sequence and do not create duplicate entries with unique table key. Otherwise, an untreatable exception is triggered.
To hashed tables, no rows can be appended.
The APPEND statement sets sy-tabix to the table index of the last appended row.
Addition
... SORTED BY comp
Effect
This addition is allowed only if you specify a workarea wa and if you use a standard table, where wa must be compatible to the row type of the table. You can specify component comp as shown in section Specifying Components, however, you can access only one single component and no attributes of classes using the object component selector.
The statement is executed in two steps:
Starting at the last row, the table is searched for a row, in which the value of component comp is greater than or equal to the value of component comp of wa. If such a row exists, the workarea wa is included after this row. If no such row exists, the workarea wa is included before the first row. The table index of all rows following the included rows increases by one.
If the number of rows before the statement is executed is greater than or equal to the number specified in the definition of the internal table in the INITIAL SIZE addition, the newly-created last row is deleted.
Note
When using only the statement APPEND with addition SORTED BY to fill an internal table, this rule results in an internal table that contains no more than the number of rows specified in its definition after INITIAL SIZE and that is sorted in descending order by component comp (ranking).
The SORT statement should usually be used instead of APPEND SORTED BY.
Example
Creating a ranking of the three flights of a connection showing the most free seats.
PARAMETERS: p_carrid TYPE sflight-carrid,
            p_connid TYPE sflight-connid.
DATA: BEGIN OF seats,
        fldate TYPE sflight-fldate,
        seatsocc TYPE sflight-seatsocc,
        seatsmax TYPE sflight-seatsmax,
        seatsfree TYPE sflight-seatsocc,
      END OF seats.
DATA seats_tab LIKE STANDARD TABLE OF seats
               INITIAL SIZE 3.
SELECT fldate seatsocc seatsmax
       FROM sflight
       INTO seats
       WHERE carrid = p_carrid AND
             connid = p_connid.
seats-seatsfree = seats-seatsmax - seats-seatsocc.
APPEND seats TO seats_tab SORTED BY seatsfree.
ENDSELECT.
Exceptions
Non-Catchable Exceptions
Cause: Including a row with identical key (target table defined with UNIQUE)
Runtime Error: ITAB_DUPLICATE_KEY_IDX_OP
Cause: Violation of the sorting sequence due to an APPEND to a sorted table
Runtime Error: ITAB_ILLEGAL_SORT_ORDER:
Cause: Unallowed index value (<= 0) for a FROM, TO, or INDEX specification
Runtime Error: TABLE_INVALID_INDEX
Syntax Diagram
UPDATE dbtab
Syntax
UPDATE target source.
Effect:
The statement UPDATE changes the content of one or more lines of the database table specified in target. The entries in source determine which columns of which lines are changed, and how they are changed.
System fields
The statement UPDATE sets the values of the system fields sy-subrc and sy-dbcnt.
sy-subrc Meaning
0 At least one line has been changed.
4 At least one line was not able to be changed, either because no appropriate line was found, or because the change would generate a line that leads to double entries in the primary key or a unique secondary index in the database table.
The statement UPDATE sets sy-dbcnt to the number of changed lines.
Note
The changes are definitively copied to the database with the next database commit. Until that point, they can still be undone using a database rollback
The statement UPDATE sets a database lock up to the next database commit or rollback, which may lead to a deadlock if used incorrectly.
For the specific database, the number of rows that can be changed within a database LUW in the database table is restricted by the fact that a database system can only manage a certain amount of data in the rollback area and from locks.

Insert using APPEND and NOLOGGING

Hi
I want to know that if we use INSERT with hint APPEND and NOLOGGING, then is the data written to rollback segment.
Please tell me how can we avoid writing to rollback segment as i am having a lot of data to insert and want to do it using select insert and not by using bulk insert.
Thanks,
Manish
Message was edited by:
user532526

is there any way that if some error occurs then the data should be rollled back If an exception occurs during the insert, the work will be rolled back automatically.
as with 20 lakh records the rollback segment will overflow.Are you sure? Have you tried it?

Log4j async appender and line number output

Hello,
I am trying to implement log4j in my application, and would like to log the caller class and the line number of the call. When I do not use async appender, the caller class and the line number are logged. However when I add the same appenders to the AsyncAppender, the caller information is lost. Please, take a look at the config and output snippets.
Thanks,
Elana
======
Here is the configuration without the use of the async appender (Async tags are commented out)
<log4j:configuration debug="true">

<appender name="SystemOut" class="org.apache.log4j.ConsoleAppender">
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern"
             value="%5p (%d{DATE}) [%t] (%F:%L) - %m%n"/>
    </layout>
</appender>
<appender name="FileOut" class="org.apache.log4j.RollingFileAppender">
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern"
             value="%5p (%d{DATE}) [%t] (%F:%L) - %m%n"/>
    </layout>
    <param name="File" value="logs/exampleAsync.log"/>
    <param name="MaxFileSize" value="100KB"/>
    <param name="MaxBackupIndex" value="1"/>
</appender>
<root>
    
      <appender-ref ref="FileOut"/>
      <appender-ref ref="SystemOut"/>
</root>
</log4j:configuration>It produces the following output:
DEBUG (08 Apr 2006 17:03:49,140) [Thread-0] (LogGenerator.java:79) - Debugging
DEBUG (08 Apr 2006 17:03:52,145) [Thread-0] (LogGenerator.java:74) - TracingHere is the configuration WITH the use of async appender
<log4j:configuration debug="true">
<appender name="ASYNC" class="org.apache.log4j.AsyncAppender">
    <appender-ref ref="SystemOut"/>
    <appender-ref ref="FileOut"/>
</appender>
<appender name="SystemOut" class="org.apache.log4j.ConsoleAppender">
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern"
             value="%5p (%d{DATE}) [%t] (%F:%L) - %m%n"/>
    </layout>
</appender>
<appender name="FileOut" class="org.apache.log4j.RollingFileAppender">
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern"
             value="%5p (%d{DATE}) [%t] (%F:%L) - %m%n"/>
    </layout>
    <param name="File" value="logs/exampleAsync.log"/>
    <param name="MaxFileSize" value="100KB"/>
    <param name="MaxBackupIndex" value="1"/>
</appender>
<root>
    <appender-ref ref="ASYNC"/>
</root>
</log4j:configuration>It produces the following output: (NOTE the question marks in the place of caller info)
DEBUG (08 Apr 2006 17:12:12,534) [Thread-1] (?:?) - Tracing
DEBUG (08 Apr 2006 17:12:15,528) [Thread-1] (?:?) - Debugging

I don't think you can use AsyncAppender with a properties file. You have to use XML and a JoranConfigurator

Regsitering log4j appender to a logger in a class in a web app

During weblogic 9.2 server startup I would like to register a Handler with any number of log4j Loggers in all deployed web apps. I was thinking I could somehow get a reference to the applications classloader, and see if it has log4j, then register with the root logger. I used to do this in WLS 8, using ApplicationContainerFactory, but this is no longer available in WLS 9. Is there another way to do this in WLS 9? Thank for any help.

Thanks. I'm using a startup class. I could easily check if log4j is in the server classpath, and attach my appender. However, if log4j is not in server classpath, and in the application classpath, I need to check for this. I was using ApplicationContainerFactory in weblogic 8 like so:
appContainerFactory.getApplicationContainer(applicationName).getApplicationClassLoader()
which is not available in weblogic 9. And I can't find in the docs anywhere to indicate it's replacement, or any type of alternative.

Log4j, appender and InstantiationException

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