Downloading JAR for temporary in-memory use or saved to local system?

Hi all,
I would like to be able to download and create a .jar file in memory, without writing it to disk, as an "option". My app should allow the user to reference an http://file.jar that gets "created" in memory on the client for temporary use, or they can optionally specify to download it and save it as a .jar file. I can't seem to find much info on either.
For the first case, basically, each time the app runs it should get the .jar file from the location specified, but without actually creating it on disk. Is it possible to download the binary of a .jar file from a web server and create it in memory so that it can be used? Or does it have to be stored on the local file system? If so, then I suppose I could use a "temporary" on disk .jar file, then delete it.
For the latter, how is a .jar file downloaded and saved to the local system?
Thanks.

I don't fully understand your question, but I think
you want to use JarInputStream.
-Ron

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TRACE-INFO: 1: [dev trc     ,00000] Thu May 12 00:09:50 2011                                     1042 0.001042
TRACE-INFO: 2: [dev trc     ,00000] load shared library (dbsdbslib.dll), hdl 0, addr 0000000186C80000
TRACE-INFO: 3:                                                                                5 0.001047
TRACE-INFO: 4: [dev trc     ,00000]      using "E:\usr\sap\EC6\SYS\exe\uc\NTAMD64\dbsdbslib.dll"
TRACE-INFO: 5:                                                                                5 0.001052
TRACE-INFO: 6: [dev trc     ,00000] } DbSlSdbControl(rc=0)                                         81 0.001133
TRACE-INFO: 7: [dev trc     ,00000] { DbSlSdbControl(con_hdl=-1,command=39,arg_p=0000000000000000)
TRACE-INFO: 8:                                                                                8 0.001141
TRACE-INFO: 9: [dev trc     ,00000] } DbSlSdbControl(rc=0)                                          8 0.001149
TRACE-INFO: 10: [dev trc     ,00000] { DbSlSdbControl(con_hdl=-1,command=10,arg_p=000000000202EBE0)
TRACE-INFO: 11:                                                                                8 0.001157
TRACE-INFO: 12: [dev trc     ,00000] } DbSlSdbControl(rc=0)                                          4 0.001161
TRACE-INFO: 13: [dev trc     ,00000] { DbSlSdbControl(con_hdl=-1,command=10,arg_p=0000000140E5A1E8)
TRACE-INFO: 14:                                                                                15 0.001176
TRACE-INFO: 15: [dev trc     ,00000] } DbSlSdbControl(rc=0)                                          5 0.001181
TRACE-INFO: 16: [dev trc     ,00000] { DbSlSdbConnect(con_info_p=0000000000000000)                  18 0.001199
TRACE-INFO: 17: [dev trc     ,00000] DBSDBSLIB : version 700.08, patch 0.024 (Make PL 0.32)         18 0.001217
TRACE-INFO: 18: [dev trc     ,00000] MAXDB shared library (dbsdbslib) patchlevels (last 10)          7 0.001224
TRACE-INFO: 19: [dev trc     ,00000]    (0.024) Default value for max. input variables is 2000 (note 655018)
TRACE-INFO: 20:                                                                                9 0.001233
TRACE-INFO: 21: [dev trc     ,00000]    (0.024) Profile parameter to define max. input variables (note 655018)
TRACE-INFO: 22:                                                                                9 0.001242
TRACE-INFO: 23: [dev trc     ,00000]    (0.024) Switch SQLMODE after CREATE INDEX SERIAL (note 1267841)
TRACE-INFO: 24:                                                                                8 0.001250
TRACE-INFO: 25: [dev trc     ,00000]    (0.024) Input parameters for SQL statements increased (note 655018)
TRACE-INFO: 26:                                                                                7 0.001257
TRACE-INFO: 27: [dev trc     ,00000]    (0.018) Create index serial for MaxDB 7.6 (note 1267841)
TRACE-INFO: 28:                                                                                8 0.001265
TRACE-INFO: 29: [dev trc     ,00000]    (0.018) More trace in case of packed to string conversion error (note 1262799)
TRACE-INFO: 30:                                                                                13 0.001278
TRACE-INFO: 31: [dev trc     ,00000]    (0.016) R3trans export aborts with signal 6 (note 1262245)
TRACE-INFO: 32:                                                                                7 0.001285
TRACE-INFO: 33: [dev trc     ,00000]    (0.009) IA64 alignment errors (note 1245982)                  7 0.001292
TRACE-INFO: 34: [dev trc     ,00000]    (0.007) Support DB-Type 'SAP DB' by UPDSTAT (note 1225668)
TRACE-INFO: 35:                                                                                7 0.001299
TRACE-INFO: 36: [dev trc     ,00000]                                                                  4 0.001303
TRACE-INFO: 37: [dev trc     ,00000]   -> init()                                                      6 0.001309
TRACE-INFO: 38: [dev trc     ,00000]   -> sdb_malloc(size=18) : 0000000002810EB0 (34 bytes allocated)
TRACE-INFO: 39:                                                                                18 0.001327
TRACE-INFO: 40: [dev trc     ,00000]    STATEMENT_CACHE_SIZE = 1000                                  46 0.001373
TRACE-INFO: 41: [dev trc     ,00000]   -> sdb_malloc(size=152000) : 00000000028B9FA0 (152050 bytes allocated)
TRACE-INFO: 42:                                                                                16 0.001389
TRACE-INFO: 43: [dev trc     ,00000]   -> sdb_malloc(size=656000) : 0000000002C200B0 (808066 bytes allocated)
TRACE-INFO: 44:                                                                                13 0.001402
TRACE-INFO: 45: [dev trc     ,00000]   -> sdb_malloc(size=288000) : 0000000002CC10B0 (1096082 bytes allocated)
TRACE-INFO: 46:                                                                                11 0.001413
TRACE-INFO: 47: [dev trc     ,00000]   -> sdb_malloc(size=16144) : 0000000002D080B0 (1112242 bytes allocated)
TRACE-INFO: 48:                                                                                11 0.001424
TRACE-INFO: 49: [dev trc     ,00000]   -> sdb_malloc(size=32048) : 0000000002D0C020 (1144306 bytes allocated)
TRACE-INFO: 50:                                                                                11 0.001435
TRACE-INFO: 51: [dev trc     ,00000]   -> loadClientRuntime()                                       358 0.001793
TRACE-INFO: 52: [dev trc     ,00000] Loading SQLDBC client runtime ...                               7 0.001800
TRACE-INFO: 53: [dev trc     ,00000] SQLDBC SDK Version : SQLDBC.H 7.6.0    BUILD 007-123-091-175
TRACE-INFO: 54:                                                                                339 0.002139
TRACE-INFO: 55: [dev trc     ,00000] SQLDBC Library Version : libSQLDBC 7.6.5    BUILD 011-123-196-300
TRACE-INFO: 56:                                                                                8 0.002147
TRACE-INFO: 57: [dev trc     ,00000] SQLDBC client runtime is MaxDB 7.6.5.011 CL 196300             21 0.002168
Regards,
vivek

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JnlpDownloadServlet(3): Request: /netintel-client/application/jviewsall.5.0.jar
JnlpDownloadServlet(3): User-Agent: JNLP/6.0 javaws/1.6.0_17 (b04) Java/1.6.0_17
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<17-Feb-2010 11:56:43 o'clock GMT> <Error> <HTTP> <BEA-101020> <[ServletContext@27407197[app:network-intell
ient spec-version:null]] Servlet failed with Exception
java.lang.IllegalStateException: Response already committed
at weblogic.servlet.internal.ServletResponseImpl.objectIfCommitted(ServletResponseImpl.java:1591)
at weblogic.servlet.internal.ServletResponseImpl.sendError(ServletResponseImpl.java:614)
at weblogic.servlet.internal.ServletResponseImpl.sendError(ServletResponseImpl.java:592)
at jnlp.sample.servlet.JnlpDownloadServlet.handleRequest(JnlpDownloadServlet.java:191)
at jnlp.sample.servlet.JnlpDownloadServlet.doGet(JnlpDownloadServlet.java:113)
Truncated. see log file for complete stacktrace
JNLP as follows
<?xml version="1.0" encoding="utf-8"?>
<jnlp spec="6.0"
codebase="http://localhost:7001/netintel-client/application"
href="launch.jnlp">
<information>
<title>Oracle Communications Network Intelligence</title>
<vendor>Oracle Corporation.</vendor>
<description>Oracle Communications Network Intelligence</description>
</information>
<security>
<all-permissions/>
</security>
<resources>
<j2se version="1.6" href="http://java.sun.com/products/autodl/j2se" java-vm-args="-Xmx1024m -Xverify:none -Xfuture"/>
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<property name="APP_SERVER_URL" value="http://localhost:7001"/>
<property name="user.language" value="en"/>
<property name="user.country" value="ie"/>
<jar href="NetIntelligence_Help_en.jar"/>
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<jar href="acegi-security-tiger-1.0.3.jar"/>
<jar href="aspectjweaver-1.5.2.jar"/>
<jar href="spring-aspects.jar"/>
<jar href="spring-modules-validation-0.5.jar"/>
<jar href="spring.jar"/>
<jar href="hibernate3.jar"/>
<jar href="antlr-2.7.6.jar"/>
<jar href="asm-attrs.jar"/>
<jar href="asm.jar"/>
<jar href="cglib-2.1.3.jar"/>
<jar href="ehcache-1.2.3.jar"/>
<jar href="jta.jar"/>
<jar href="dom4j-1.6.1.jar"/>
<jar href="jcalendar-flib-apache.jar"/>
<jar href="jhall.jar"/>
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<jar href="commons-attributes-compiler.jar"/>
<jar href="commons-beanutils.jar"/>
<jar href="commons-codec-1.3.jar"/>
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<jar href="commons-dbcp.jar"/>
<jar href="commons-digester.jar"/>
<jar href="commons-fileupload.jar"/>
<jar href="commons-httpclient-3.0.1.jar"/>
<jar href="commons-io-1.3.1.jar"/>
<jar href="commons-lang.jar"/>
<jar href="commons-logging-1.1.jar"/>
<jar href="commons-pool.jar"/>
<jar href="commons-validator.jar"/>
<jar href="log4j-1.2.11.jar"/>
<jar href="binding-1.1.1.jar"/>
<jar href="forms-1.0.6.jar"/>
<jar href="looks-2.1.1.jar"/>
<jar href="xstream-1.2.jar"/>
<jar href="netsure_ui.jar"/>
<jar href="netsure_business.jar"/>
<jar href="netsure_domain.jar"/>
<jar href="netsure_common.jar"/>
<jar href="jviewsall.5.0.jar "/>
<jar href="netsure_modules.jar" main="true"/>
</resources>
<application-desc main-class="com.netsure.capman.app.AppMain"/>
</jnlp>
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netsure_modules.jar is 3802341 bytes
None of the other jars raise this exception
The next largest jar is 2846594 bytes
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Has anyone encountered anything similiar ?
I am aware of an old thread forum http://forums.sun.com/thread.jspa?forumID=38&threadID=183571 concerning the download of updated files . This was last updated in 2007

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I updated the invalid syntax identified by both these tools - namely adding an association mime-type jnlp and moving the properies to the bottom of the resources. Unfortunately the same exception occurs.
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<jnlp spec="6.0"
codebase="http://localhost:7001/netintel-client/application"
href="launch.jnlp">
<information>
<title>Oracle Communications Network Intelligence</title>
<vendor>Oracle Corporation.</vendor>
<description>Oracle Communications Network Intelligence</description>
<association mime-type="application/x-java-jnlp-file" extensions="jnlp"/>
</information>
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<all-permissions/>
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<jar href="NetIntelligence_Help_en.jar"/>
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<jar href="acegi-security-tiger-1.0.3.jar"/>
<jar href="aspectjweaver-1.5.2.jar"/>
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<jar href="spring-modules-validation-0.5.jar"/>
<jar href="spring.jar"/>
<jar href="hibernate3.jar"/>
<jar href="antlr-2.7.6.jar"/>
<jar href="asm-attrs.jar"/>
<jar href="asm.jar"/>
<jar href="cglib-2.1.3.jar"/>
<jar href="ehcache-1.2.3.jar"/>
<jar href="jta.jar"/>
<jar href="dom4j-1.6.1.jar"/>
<jar href="jcalendar-flib-apache.jar"/>
<jar href="jhall.jar"/>
<jar href="joda-time-1.4.jar"/>
<jar href="commons-attributes-api.jar"/>
<jar href="commons-attributes-compiler.jar"/>
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<jar href="commons-codec-1.3.jar"/>
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<jar href="commons-dbcp.jar"/>
<jar href="commons-digester.jar"/>
<jar href="commons-fileupload.jar"/>
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<jar href="commons-io-1.3.1.jar"/>
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<jar href="commons-logging-1.1.jar"/>
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<property name="log4j.configuration" value="log4j-modules.properties"/>
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Limit for EXPORT TO MEMORY ID statement

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I would like to know whether is any limit to the size of the data(size of <int_tab> below) which we can export to ABAP memory using statement -
EXPORT <int_tab> TO MEMORY ID 'XXXX'.
I have read the F1 help of export, there size 30000 bytes is mentioned if we export to shared memory but for export to ABAP memory it is mentioned anything like that.
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Regards
Munish Garg

I supposed that the abap code hasn't limits, but the admin has certain parameters for limit users memory or something else. Overcharging system memory get that machines are slower than usual.

Memory used by oracle 11g processes on solaris 10

I am running oracle 11.1.0.7 on solaris 10. The database uses some 280M virtual memory size for each oracle backup or user process. See the SZ column in output of ps -efl below.
I just wonder how come oracle that much of memory for each process. Is that something we can control through some system/database parameters or is that the way oracle 11g on solaris works?
oracle@taut $ ps -efl|grep cttrain6
F S UID PID PPID C PRI NI ADDR SZ WCHAN STIME TTY TIME CMD
0 S oracle 2490 1 0 40 20 ? 284111 ? 12:23:37 ? 0:01 ora_q001_cttrain6
0 S oracle 9698 1 0 40 20 ? 283837 ? 13:37:51 ? 0:00 ora_w000_cttrain6
0 S oracle 2147 1 0 40 20 ? 285464 ? 12:18:11 ? 0:15 ora_lgwr_cttrain6
0 S oracle 2135 1 0 40 20 ? 283878 ? 12:18:09 ? 0:17 ora_dia0_cttrain6
0 S oracle 9979 11472 0 50 20 ? 211 ? 13:40:24 pts/2 0:00 grep cttrain6
0 S oracle 2157 1 0 40 20 ? 283942 ? 12:18:13 ? 0:47 ora_mmnl_cttrain6
0 S oracle 2129 1 0 40 20 ? 283830 ? 12:18:09 ? 0:06 ora_diag_cttrain6
0 S root 2159 1 0 40 20 ? 263214 ? 12:18:13 ? 3:52 ora_dism_cttrain6
0 S oracle 9565 1 0 40 20 ? 283861 ? 13:35:18 ? 0:00 oraclecttrain6 (LOCAL=NO)
0 S oracle 2482 1 0 40 20 ? 283837 ? 12:22:55 ? 0:01 ora_q000_cttrain6
0 S oracle 2884 1 0 40 20 ? 283830 ? 12:27:46 ? 0:01 ora_smco_cttrain6
0 S oracle 2153 1 0 40 20 ? 283846 ? 12:18:12 ? 0:01 ora_reco_cttrain6
0 S oracle 2464 1 0 40 20 ? 284150 ? 12:22:42 ? 0:01 ora_fbda_cttrain6
0 S oracle 2123 1 0 40 20 ? 284270 ? 12:18:08 ? 0:14 ora_pmon_cttrain6
0 S oracle 2454 1 0 40 20 ? 285190 ? 12:22:34 ? 0:01 ora_arc1_cttrain6
0 S oracle 2145 1 0 40 20 ? 284792 ? 12:18:11 ? 0:06 ora_dbw3_cttrain6
0 S oracle 2141 1 0 40 20 ? 284792 ? 12:18:10 ? 0:08 ora_dbw1_cttrain6
0 S oracle 2149 1 0 40 20 ? 284112 ? 12:18:11 ? 0:25 ora_ckpt_cttrain6
0 S oracle 9513 1 0 40 20 ? 283885 ? 13:34:18 ? 0:02 oraclecttrain6 (LOCAL=NO)
0 S oracle 2125 1 0 0 RT ? 283830 ? 12:18:08 ? 0:07 ora_vktm_cttrain6
0 S oracle 2143 1 0 40 20 ? 284792 ? 12:18:10 ? 0:04 ora_dbw2_cttrain6
0 S oracle 2459 1 0 40 20 ? 285198 ? 12:22:35 ? 0:01 ora_arc3_cttrain6
0 S oracle 2451 1 0 40 20 ? 285190 ? 12:22:33 ? 0:01 ora_arc0_cttrain6
0 S oracle 2131 1 0 40 20 ? 283838 ? 12:18:09 ? 0:02 ora_dbrm_cttrain6
0 S oracle 2139 1 0 40 20 ? 284872 ? 12:18:10 ? 0:03 ora_dbw0_cttrain6
0 S oracle 2466 1 0 40 20 ? 283830 ? 12:22:44 ? 0:01 ora_qmnc_cttrain6
0 S oracle 2151 1 0 40 20 ? 283974 ? 12:18:12 ? 0:05 ora_smon_cttrain6
0 S oracle 2457 1 0 40 20 ? 285198 ? 12:22:34 ? 0:01 ora_arc2_cttrain6
0 S oracle 2133 1 0 40 20 ? 283830 ? 12:18:09 ? 0:02 ora_psp0_cttrain6
0 S oracle 2155 1 0 40 20 ? 284656 ? 12:18:12 ? 0:11 ora_mmon_cttrain6
0 S oracle 2137 1 0 40 20 ? 283830 ? 12:18:09 ? 0:02 ora_mman_cttrain6

user567271 wrote:
I am running oracle 11.1.0.7 on solaris 10. The database uses some 280M virtual memory size for each oracle backup or user process. See the SZ column in output of ps -efl below.
I just wonder how come oracle that much of memory for each process. Is that something we can control through some system/database parameters or is that the way oracle 11g on solaris works?As you have already said, it is "virtual" memory. This is not real, "physical" memory. Solaris has a virtual memory sub-system layer in it, as do almost all other modern operating systems. Google "operating system virtual memory" to find out more on what virtual memory is and how it works.
In terms of your question, virtual memory means that not all of a process's memory space needs to be in physical memory for it to run and execute. The process virtual memory space is broken up into equal sized pages, and only those pages currently being referenced (used) are mapped and read into physical memory pages. Thus the virtual size of a process is irrelevant to how much physical memory is being used. Look at the RSS column (ps -ely) for the physical memory used by each process - Resident Set Size.
Furthermore, an Oracle shadow server process (oracle) uses a large segment of shared memory for the SGA. This shared memory only exists once in physical memory, and is shared amongst all the shadow server processes. But it is mapped into the address space of each process, and so appears and is counted in the virtual and physical memory of each process.
So each reported virtual size (SZ) of each oracle process is also counting the mapped shared memory pages in each process, and so counting the same pages multiple times across all the oracle processes. You need to subtract the size of the SGA shared memory from the virtual size of each oracle process to determine the private, local memory per shadow process.
If you want a further breakdown of the memory map of each process, look at the manual pages for pmap (man pmap), which will break it down by text, private data, zero initialized, shared and other types. By subtracting the shared size from the resident size you can get a true view of the private, local memory per oracle shadow server process.
John

Downloading JAR for temporary in-memory use or saved to local system?

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