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maven本地三方依賴包插件addjars-maven-plugin

maven項目中有很多本地三方依賴，但是一個一個加入dependency + system scope又很麻煩，又貌似沒有搜索到通配符的成功案例，但是從stackoverflow上看到一個插件addjars-maven-plugin, 可以很好解決這類需求:

    <build>
        <plugins>
            <plugin>
                <groupId>com.googlecode.addjars-maven-plugin</groupId>
                <artifactId>addjars-maven-plugin</artifactId>
                <version>1.0.2</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>add-jars</goal>
                        </goals>
                        <configuration>
                            <resources>
                                <resource>
                                    <directory>${basedir}/../lib</directory>
                                </resource>
                            </resources>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-assembly-plugin</artifactId>
                <version>${maven.assembly.version}</version>
                <configuration>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                    <appendAssemblyId>false</appendAssemblyId>
                </configuration>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

把項目中依賴的三方jars全放到lib目錄里，就全部會打包到release jar里了

posted @ 2013-10-30 14:03 Milo的海域閱讀(1943) | 評論 (0) | 編輯收藏

htonll & ntohll in C

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <inttypes.h>

uint64_t htonll(uint64_t val) {
    return (((uint64_t) htonl(val)) << 32) + htonl(val >> 32);
}

uint64_t ntohll(uint64_t val) {
    return (((uint64_t) ntohl(val)) << 32) + ntohl(val >> 32);
}
int main() {
    uint64_t hll = 0x1122334455667788;
    printf("uint64: %"PRIu64"\n", hll);
    printf("0x%"PRIX64"\n", hll);
    printf("htonll(hll) = 0x%"PRIX64"\n", htonll(hll));
    printf("ntohll(htonll(hll)) = 0x%"PRIX64"\n", ntohll(htonll(hll)));
    printf("ntohll(hll) = 0x%"PRIX64"\n", ntohll(hll)); // no change
    return 1;
}

big endian(network byte order), little endian (host byte order in intel arch)

posted @ 2013-07-23 16:42 Milo的海域閱讀(3314) | 評論 (0) | 編輯收藏

反編譯java class并優雅的調試

用jd-eclipse 插件來反編譯java class文件的輸出還是挺nice的，雖然閱讀方便了但是對debug確造成一定的困擾，主要問題是line number的不match.
Google了下遇到類似問題的真不少。最終找到了解決方案：

http://sourceforge.net/projects/realignmentjd/files/
-----------------

1. Download JD-Eclipse and JD-GUI - http://java.decompiler.free.fr/ and install.
2. Put a file realignment.jd.ide.eclipse_1.0.2.jar in eclipse/plugins directory.
    To use Realignment feature it is necessary to open the menu Preferences/General/Editors/File Associations and to select "*.class" file type and to choose "Realignment for JD Class File Editor" for Associated editors.
    Another possibility is the batch realignment after processing JD-GUI. To work properly you must to switch on the property "Display line numbers" in Help/Preferences of JD-GUI.
    To use this feature it is necessary to open the menu Preferences/Java/Decompiler/Batch Realignment and click button "Open dialog". Existing limitation: the realignment is performed only for the methods.
To work properly it is necessary that the property "Display line numbers" in menu "Preferences/Java/Decompiler" was active.

JD-Eclipse插件 + realignment 補丁讓優雅的debug class 文件成為可能。

如果只是為了閱讀class代碼，建議不要用realignment 補丁，這樣會降低代碼的可讀性（會多出大量的空行）

posted @ 2013-02-22 15:01 Milo的海域閱讀(2055) | 評論 (0) | 編輯收藏

ubuntu下用dpkg命令查詢erlang各種package的簡要描述

sudo dpkg -l \*erlang\*
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                          Version                       Description
+++-=============================-=============================-==========================================================================
ii  erlang                        1:14.b.4-dfsg-1ubuntu1        Concurrent, real-time, distributed functional language
un  erlang-abi-13.a               <none>                        (no description available)
ii  erlang-appmon                 1:14.b.4-dfsg-1ubuntu1        Erlang/OTP application monitor
ii  erlang-asn1                   1:14.b.4-dfsg-1ubuntu1        Erlang/OTP modules for ASN.1 support
rc  erlang-base                   1:14.b.4-dfsg-1ubuntu1        Erlang/OTP virtual machine and base applications
ii  erlang-base-hipe              1:14.b.4-dfsg-1ubuntu1        Erlang/OTP HiPE enabled virtual machine and base applications
ii  erlang-common-test            1:14.b.4-dfsg-1ubuntu1        Erlang/OTP application for automated testing
ii  erlang-corba                  1:14.b.4-dfsg-1ubuntu1        Erlang/OTP applications for CORBA support
ii  erlang-crypto                 1:14.b.4-dfsg-1ubuntu1        Erlang/OTP cryptographic modules
ii  erlang-debugger               1:14.b.4-dfsg-1ubuntu1        Erlang/OTP application for debugging and testing
ii  erlang-dev                    1:14.b.4-dfsg-1ubuntu1        Erlang/OTP development libraries and headers
ii  erlang-dialyzer               1:14.b.4-dfsg-1ubuntu1        Erlang/OTP discrepancy analyzer application
ii  erlang-diameter               1:14.b.4-dfsg-1ubuntu1        Erlang/OTP implementation of RFC 3588 protocol
ii  erlang-doc                    1:14.b.4-dfsg-1ubuntu1        Erlang/OTP HTML/PDF documentation
un  erlang-doc-html               <none>                        (no description available)
ii  erlang-docbuilder             1:14.b.4-dfsg-1ubuntu1        Erlang/OTP application for building HTML documentation
ii  erlang-edoc                   1:14.b.4-dfsg-1ubuntu1        Erlang/OTP module for generating documentation
ii  erlang-erl-docgen             1:14.b.4-dfsg-1ubuntu1        Erlang/OTP documentation stylesheets
ii  erlang-et                     1:14.b.4-dfsg-1ubuntu1        Erlang/OTP event tracer application
ii  erlang-eunit                  1:14.b.4-dfsg-1ubuntu1        Erlang/OTP module for unit testing
ii  erlang-examples               1:14.b.4-dfsg-1ubuntu1        Erlang/OTP application examples
ii  erlang-gs                     1:14.b.4-dfsg-1ubuntu1        Erlang/OTP graphics system
ii  erlang-ic                     1:14.b.4-dfsg-1ubuntu1        Erlang/OTP IDL compiler
ii  erlang-ic-java                1:14.b.4-dfsg-1ubuntu1        Erlang/OTP IDL compiler (Java classes)
ii  erlang-inets                  1:14.b.4-dfsg-1ubuntu1        Erlang/OTP Internet clients and servers
ii  erlang-inviso                 1:14.b.4-dfsg-1ubuntu1        Erlang/OTP trace tool
ii  erlang-jinterface             1:14.b.4-dfsg-1ubuntu1        Java communication tool to Erlang
ii  erlang-manpages               1:14.b.4-dfsg-1ubuntu1        Erlang/OTP manual pages
ii  erlang-megaco                 1:14.b.4-dfsg-1ubuntu1        Erlang/OTP implementation of Megaco/H.248 protocol
ii  erlang-mnesia                 1:14.b.4-dfsg-1ubuntu1        Erlang/OTP distributed relational/object hybrid database
ii  erlang-mode                   1:14.b.4-dfsg-1ubuntu1        Erlang major editing mode for Emacs
ii  erlang-nox                    1:14.b.4-dfsg-1ubuntu1        Erlang/OTP applications that don't require X Window System
ii  erlang-observer               1:14.b.4-dfsg-1ubuntu1        Erlang/OTP application for investigating distributed systems
ii  erlang-odbc                   1:14.b.4-dfsg-1ubuntu1        Erlang/OTP interface to SQL databases
ii  erlang-os-mon                 1:14.b.4-dfsg-1ubuntu1        Erlang/OTP operating system monitor
ii  erlang-parsetools             1:14.b.4-dfsg-1ubuntu1        Erlang/OTP parsing tools
ii  erlang-percept                1:14.b.4-dfsg-1ubuntu1        Erlang/OTP concurrency profiling tool
ii  erlang-pman                   1:14.b.4-dfsg-1ubuntu1        Erlang/OTP process manager
ii  erlang-public-key             1:14.b.4-dfsg-1ubuntu1        Erlang/OTP public key infrastructure
ii  erlang-reltool                1:14.b.4-dfsg-1ubuntu1        Erlang/OTP release management tool
ii  erlang-runtime-tools          1:14.b.4-dfsg-1ubuntu1        Erlang/OTP runtime tracing/debugging tools
ii  erlang-snmp                   1:14.b.4-dfsg-1ubuntu1        Erlang/OTP SNMP applications
ii  erlang-src                    1:14.b.4-dfsg-1ubuntu1        Erlang/OTP applications sources
ii  erlang-ssh                    1:14.b.4-dfsg-1ubuntu1        Erlang/OTP implementation of SSH protocol
ii  erlang-ssl                    1:14.b.4-dfsg-1ubuntu1        Erlang/OTP implementation of SSL
ii  erlang-syntax-tools           1:14.b.4-dfsg-1ubuntu1        Erlang/OTP modules for handling abstract Erlang syntax trees
ii  erlang-test-server            1:14.b.4-dfsg-1ubuntu1        Erlang/OTP server for automated application testing
ii  erlang-toolbar                1:14.b.4-dfsg-1ubuntu1        Erlang/OTP graphical toolbar
ii  erlang-tools                  1:14.b.4-dfsg-1ubuntu1        Erlang/OTP various tools
ii  erlang-tv                     1:14.b.4-dfsg-1ubuntu1        Erlang/OTP table viewer
ii  erlang-typer                  1:14.b.4-dfsg-1ubuntu1        Erlang/OTP code type annotator
ii  erlang-webtool                1:14.b.4-dfsg-1ubuntu1        Erlang/OTP helper for web-based tools
ii  erlang-x11                    1:14.b.4-dfsg-1ubuntu1        Erlang/OTP applications that require X Window System
ii  erlang-xmerl                  1:14.b.4-dfsg-1ubuntu1        Erlang/OTP XML tools

erlang-dev包含頭文件，erlang-src包含源代碼，erlang-debugger包含調試工具，erlang-base包含虛擬機

還可以根據package 名字的suffix察看erlang man doc，比如

man 3erl erlang
man 3erl mnesia
man 3erl io

posted @ 2013-01-15 11:34 Milo的海域閱讀(680) | 評論 (0) | 編輯收藏

erlang: Call to i:im/0 in application debugger failed.

命令行調試erlang程序報錯：

2> c(hello, [debug_info]).
{ok,hello}
3> im().
Call to i:im/0 in application debugger failed.
ok

google之原來是erlang-debugger沒裝

sudo apt-get install erlang-debugger

然后Monitor窗口就出來了。不過用eclipse 的erlide插件調試也可以。

posted @ 2013-01-11 17:06 Milo的海域閱讀(460) | 評論 (0) | 編輯收藏

一些項目中用到的mvn例子

mvn 執行外部命令
命令行模式

mvn exec:exec -Dexec.executable=sh -Dexec.workingdir=./bin -Dexec.args=hello.sh

配置文件形式

                        <plugin>
                                <groupId>org.codehaus.mojo</groupId>
                                <artifactId>exec-maven-plugin</artifactId>
                                <executions>
                                        <execution>
                                                <id>test-exec</id>
                                                <phase>initialize</phase>
                                                <configuration>
                                                        <executable>sh</executable>
                                                        <workingDirectory>./bin</workingDirectory>
                                                        <arguments>
                                                                <argument>hello.sh</argument>
                                                        </arguments>
                                                </configuration>
                                                <goals>
                                                        <goal>exec</goal>
                                                </goals>
                                        </execution>
                                </executions>
                        </plugin>

mvn 生成java項目
生成骨架

mvn archetype:generate -DgroupId=com.abc.product -DartifactId=product -DpackageName=com.abc.product -DarchetypeArtifactId=maven-archetype-quickstart

轉成eclipse能識別的java 項目

mvn eclipse:eclipse

導入eclipse 然后coding

mvn進行單元測試

                        <plugin>
                                <groupId>org.apache.maven.plugins</groupId>
                                <artifactId>maven-surefire-plugin</artifactId>
                                <version>2.12.4</version>
                                <configuration>
                                        <forkMode>pertest</forkMode>
                                        <excludes>
                                                <exclude>**/perftest/*.java</exclude>
                                        </excludes>
                                        <systemProperties>
                                                <property>
                                                        <name>log4j.configuration</name>
                                                        <value>target/test-classes/log4j.properties</value>
                                                </property>
                                        </systemProperties>
                                </configuration>
                        </plugin>

mvn進行code coverage統計

<reporting>
    <plugins>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>emma-maven-plugin</artifactId>
        <version>1.0-alpha-3</version>
        <inherited>true</inherited>
      </plugin>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>surefire-report-maven-plugin</artifactId>
        <inherited>true</inherited>
      </plugin>
    </plugins>
</reporting>

mvn生成javadoc

                        <plugin>
                                <groupId>org.apache.maven.plugins</groupId>
                                <artifactId>maven-javadoc-plugin</artifactId>
                                <version>2.9</version>
                                <configuration>
                                        <show>private</show>
                                </configuration>
                                <executions>
                                        <execution>
                                                <id>attach-javadocs</id>
                                                <goals>
                                                        <goal>javadoc</goal>
                                                        <goal>test-javadoc</goal>
                                                </goals>
                                                <phase>site</phase>
                                        </execution>
                                </executions>
                        </plugin>

posted @ 2013-01-10 13:33 Milo的海域閱讀(1295) | 評論 (0) | 編輯收藏

關于java.library.path

最近項目要用JNI, 涉及到用java.library.path這個參數，開始以為只要ldconfig能識別到的so文件java 一定能找到，可惜并不是這樣。。
要想java程序找到共享庫還是要在執行java程序的時候指定java.library.path，用eclipse的話可以設置如下：

Properties->Run/Debug settings->Arguments->VM arguments
-----------------------------------------
-Djava.library.path=/home/miaoyachun/workspace/JNIC/Release

這個是傳統的方式，google了下有個tricky的方式讓程序動態修改java.library.path

    private static void loadJNILibDynamically() {
        try {
            System.setProperty("java.library.path", System.getProperty("java.library.path")
                    + ":/home/miaoyachun/workspace/JNIC/Release/");
            Field fieldSysPath = ClassLoader.class.getDeclaredField("sys_paths");
            fieldSysPath.setAccessible(true);
            fieldSysPath.set(null, null);

            System.loadLibrary("JNIC");
        } catch (Exception e) {
            // do nothing for exception
        }
    }

事實上linux下還有個環境變量LD_LIBRARY_PATH，如果lib能在這個path里找到，java.library.path就不用配置了，而且不需要關心lib之間依賴的問題。java.library.path在這方面就弱很多，比如lib依賴其他目錄的lib等。

posted @ 2012-12-06 11:05 Milo的海域閱讀(6870) | 評論 (0) | 編輯收藏

關于arp_ignore

今天有同事反應一個網絡現象，一個多網卡環境，發給eth1的數據包都被eth0接收了。
第一印象是arp的問題。Google了下得到了確認，有個相關的kernal參數:

arp_ignore - INTEGER
Define different modes for sending replies in response to
received ARP requests that resolve local target IP addresses:
0 - (default): reply for any local target IP address, configured
on any interface
1 - reply only if the target IP address is local address
configured on the incoming interface
2 - reply only if the target IP address is local address
configured on the incoming interface and both with the
sender's IP address are part from same subnet on this interface
3 - do not reply for local addresses configured with scope host,
only resolutions for global and link addresses are replied
4-7 - reserved
8 - do not reply for all local addresses

默認是0，解決這個問題需要配置為1

臨時配置下

sysctl -w net.ipv4.conf.all.arp_ignore=1

持久配置

sysctl -w net.ipv4.conf.all.arp_ignore=1
echo 'net.ipv4.conf.all.arp_ignore=1' >> /etc/sysctl.conf

這個弄好可以重啟network服務來確保其他機器更新arp cache，如果不方便重啟network，自己手動敲arping命令，比如

arping -q -A -c 1 -I eth1 10.197.24.177

這個命令是在 /etc/sysconfig/network-scripts/ifup-eth里看到的

如果機器比較少，也可以直接用arp -d 來刪除相關的cache，建議上面的那種發廣播的方式。

posted @ 2012-11-27 17:16 Milo的海域閱讀(667) | 評論 (0) | 編輯收藏

linux磁盤raid相關

檢測磁盤相關信息

smartctl -a /dev/sda

(smartctl工具來自smartmontools, 可以apt-get install smartmontools來安裝)

檢測所有raid設備

mdadm -Ds

檢測具體raid設備信息

mdadm -D /dev/md0

創建raid設備

mdadm --create --verbose /dev/md0 --level=raid0 --raid-devices=8 /dev/sdd /dev/sdc /dev/sdf /dev/sde /dev/sdg /dev/sdh /dev/sdi /dev/sdj

停止raid設備

mdadm -S /dev/md0

格式化raid設備

mkfs -t xfs -f /dev/md0

掛載raid設備

mount -t xfs /dev/md0 /raid

切換raid模式的步驟

    1. umount if mounted : umount /raid
    2. stop raid device: mdadm -S /dev/md0
    3. create raid: mdadm --create ...
    4. update /etc/mdadm.conf with output of 'mdadm -Ds', 用來開機自動組raid
    5. update /etc/fstab, 如果需要開機自動mount

Ref:

http://francs3.blog.163.com/blog/static/40576727201212145744783/

http://hi.baidu.com/powersaven/item/1da2dc147a8be2e25f53b19e

posted @ 2012-11-07 13:23 Milo的海域閱讀(270) | 評論 (0) | 編輯收藏

Ubuntu上的alternatives

關于alternatives的用法

alternatives --install /usr/bin/java java /opt/jdk1.5.0_22/bin/java 15000
alternatives --install /usr/bin/javac javac /opt/jdk1.5.0_22/bin/javac 15000
alternatives --config java
alternatives --config javac

最近切換桌面環境到ubuntu, 發現alternatives這個工具改名了:update-alternatives
用法還是一樣的。。

posted @ 2012-10-26 13:31 Milo的海域閱讀(819) | 評論 (0) | 編輯收藏

miaoyachun

maven本地三方依賴包插件addjars-maven-plugin

htonll & ntohll in C

反編譯java class并優雅的調試

ubuntu下用dpkg命令查詢erlang各種package的簡要描述

erlang: Call to i:im/0 in application debugger failed.

一些項目中用到的mvn例子

關于java.library.path

關于arp_ignore

linux磁盤raid相關

Ubuntu上的alternatives

日歷

常用鏈接

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