How do I set the proxy to be used by the JVM

Question

Many times  a Java app needs to connect to the Internet  The most common example happens when it is reading an XML file and needs to download its schema   I am behind a proxy server  How can I set my JVM to use the proxy

User · Answer

reading an XML file and needs to download its schema

If you are counting on retrieving schemas or DTDs over the internet, you're building a slow, chatty, fragile application. What happens when that remote server hosting the file takes planned or unplanned downtime? Your app breaks. Is that OK?

See http://xml.apache.org/commons/components/resolver/resolver-article.html#s.catalog.files

URL's for schemas and the like are best thought of as unique identifiers. Not as requests to actually access that file remotely. Do some google searching on "XML catalog". An XML catalog allows you to host such resources locally, resolving the slowness, chattiness and fragility.

It's basically a permanently cached copy of the remote content. And that's OK, since the remote content will never change. If there's ever an update, it'd be at a different URL. Making the actual retrieval of the resource over the internet especially silly.

User · Answer

If you want  Socks Proxy   inform the  socksProxyHost  and  socksProxyPort  VM arguments   e g   java -DsocksProxyHost 127 0 0 1 -DsocksProxyPort 8080 org example Main

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The following shows how to set in Java a proxy with proxy user and proxy password from the command line  which is a very common case  You should not save passwords and hosts in the code  as a rule in the first place    Passing the system properties in command line with -D and setting them in the code with System setProperty  name    value   is equivalent    But note this  Example that works    C  temp gt java -Dhttps proxyHost host -Dhttps proxyPort port -Dhttps proxyUser user -Dhttps proxyPassword  password  -Djavax net ssl trustStore c  cacerts -Djavax net ssl trustStorePassword changeit com andreas JavaNetHttpConnection   But the following does not work   C  temp gt java com andreas JavaNetHttpConnection -Dhttps proxyHost host -Dhttps proxyPort port -Dhttps proxyUser user -Dhttps proxyPassword  password  -Djavax net ssl trustStore c  cacerts -Djavax net ssl trustStorePassword changeit   The only difference is the position of the system properties   before and after the class   If you have special characters in password  you are allowed to put it in quotes   MyPass123    like in the above example    If you access an HTTPS service  you have to use https proxyHost  https proxyPort etc    If you access an HTTP service  you have to use http proxyHost  http proxyPort etc

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You can set some properties about the proxy server as jvm parameters  -Dhttp proxyPort 8080  proxyHost  etc   but if you need pass through an authenticating proxy  you need an authenticator like this example   ProxyAuthenticator java  import java net    import java io     public class ProxyAuthenticator extends Authenticator        private String userName  password       protected PasswordAuthentication getPasswordAuthentication             return new PasswordAuthentication userName  password toCharArray                public ProxyAuthenticator String userName  String password            this userName   userName          this password   password            Example java      import java net Authenticator      import ProxyAuthenticator   public class Example        public static void main String   args            String username   System getProperty  proxy authentication username            String password   System getProperty  proxy authentication password                     if  username    null  amp  amp   username equals                    Authenticator setDefault new ProxyAuthenticator username  password                                  here your JVM will be authenticated            Based on this reply  http   mail-archives apache org mod mbox jakarta-jmeter-user 200208 mbox  3C494FD350388AD511A9DD00025530F33102F1DC2C MMSX006 3E

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To set an HTTP HTTPS and or SOCKS proxy programmatically        public void setProxy         if  isUseHTTPProxy                 HTTP HTTPS Proxy         System setProperty  http proxyHost   getHTTPHost             System setProperty  http proxyPort   getHTTPPort             System setProperty  https proxyHost   getHTTPHost             System setProperty  https proxyPort   getHTTPPort             if  isUseHTTPAuth                  String encoded   new String Base64 encodeBase64  getHTTPUsername           getHTTPPassword    getBytes                  con setRequestProperty  Proxy-Authorization    Basic     encoded               Authenticator setDefault new ProxyAuth getHTTPUsername    getHTTPPassword                          if  isUseSOCKSProxy                 SOCKS Proxy         System setProperty  socksProxyHost   getSOCKSHost             System setProperty  socksProxyPort   getSOCKSPort             if  isUseSOCKSAuth                  System setProperty  java net socks username   getSOCKSUsername                 System setProperty  java net socks password   getSOCKSPassword                 Authenticator setDefault new ProxyAuth getSOCKSUsername    getSOCKSPassword                              public class ProxyAuth extends Authenticator       private PasswordAuthentication auth       private ProxyAuth String user  String password            auth   new PasswordAuthentication user  password    null   new char       password toCharArray                protected PasswordAuthentication getPasswordAuthentication             return auth                 Remember that HTTP proxies and SOCKS proxies operate at different levels in the network stack  so you can use one or the other or both

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I am also behind firewall  this worked for me    System setProperty  http proxyHost    proxy host addr    System setProperty  http proxyPort    808    Authenticator setDefault new Authenticator         protected PasswordAuthentication getPasswordAuthentication              return new PasswordAuthentication  domain  user   password  toCharArray                URL url   new URL  http   www google com     URLConnection con   url openConnection     BufferedReader in   new BufferedReader new InputStreamReader                      con getInputStream          Read it     String inputLine  while   inputLine   in readLine       null      System out println inputLine    in close

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Recently I ve discovered the way to allow JVM to use browser proxy settings  What you need to do is to add   java home  lib deploy jar to your project and to init the library like the following   import com sun deploy net proxy DeployProxySelector  import com sun deploy services PlatformType  import com sun deploy services ServiceManager   import org apache commons logging Log  import org apache commons logging LogFactory   public abstract class ExtendedProxyManager        private static final Log logger   LogFactory getLog ExtendedProxyManager class                   After calling this method  proxy settings can be magically retrieved from default browser settings              public static boolean init             logger debug  Init started                Initialization code was taken from com sun deploy ClientContainer          ServiceManager                  setService System getProperty  os name   toLowerCase   indexOf  windows      -1   PlatformType STANDALONE TIGER WIN32                           PlatformType STANDALONE TIGER UNIX            try                  This will call ProxySelector setDefault                DeployProxySelector reset              catch  Throwable throwable                logger error  Unable to initialize extended dynamic browser proxy settings support    throwable                return false                     return true            Afterwards the proxy settings are available to Java API via java net ProxySelector   The only problem with this approach is that you need to start JVM with deploy jar in bootclasspath e g  java -Xbootclasspath a   JAVA HOME  jre lib deploy jar  -jar my jar  If somebody knows how to overcome this limitation  let me know

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You can utilize the http proxy  JVM variables if you re within a standalone JVM but you SHOULD NOT modify their startup scripts and or do this within your application server  except maybe jboss or tomcat    Instead you should utilize the JAVA Proxy API  not System setProperty  or utilize the vendor s own configuration options   Both WebSphere and WebLogic have very defined ways of setting up the proxies that are far more powerful than the J2SE one   Additionally  for WebSphere and WebLogic you will likely break your application server in little ways by overriding the startup scripts  particularly the server s interop processes as you might be telling them to use your proxy as well

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Set the java net useSystemProxies property to true  You can set it  for example  through the JAVA TOOL OPTIONS environmental variable  In Ubuntu  you can  for example  add the following line to  bashrc      export JAVA TOOL OPTIONS    -Djava net useSystemProxies true

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That works for me   public void setHttpProxy boolean isNeedProxy        if  isNeedProxy            System setProperty  http proxyHost   getProxyHost             System setProperty  http proxyPort   getProxyPort           else           System clearProperty  http proxyHost            System clearProperty  http proxyPort              P S  I base on GHad s answer

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To use the system proxy setup   java -Djava net useSystemProxies true       Or programatically   System setProperty  java net useSystemProxies    true      Source  http   docs oracle com javase 7 docs api java net doc-files net-properties html

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Combining Sorter s and javabrett Leonel s answers   java -Dhttp proxyHost 10 10 10 10 -Dhttp proxyPort 8080 -Dhttp proxyUser username -Dhttp proxyPassword password -jar myJar jar

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Add this before you connect to a URL behind a proxy   System getProperties   put  http proxyHost    someProxyURL    System getProperties   put  http proxyPort    someProxyPort    System getProperties   put  http proxyUser    someUserName    System getProperties   put  http proxyPassword    somePassword

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As is pointed out in other answers  if you need to use Authenticated proxies  there s no reliable way to do this purely using command-line variables - which is annoying if you re using someone else s application and don t want to mess with the source code   Will Iverson makes the helpful suggestion over at Using HttpProxy to connect to a host with preemtive authentication to use a Proxy-management tool such as Proxifier   http   www proxifier com  for Mac OS X and Windows  to handle this   For example with Proxifier you can set it up to only intercept java commands to be managed and redirected through its  authenticated  proxy  You re going to want to set the proxyHost and proxyPort values to blank in this case though  e g  pass in -Dhttp proxyHost  -Dhttp proxyPort  to your java commands

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JVM uses the proxy to make HTTP calls  System getProperties   put  http proxyHost    someProxyURL    System getProperties   put  http proxyPort    someProxyPort      This may use user setting proxy  System setProperty  java net useSystemProxies    true

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I think configuring WINHTTP will also work   Many programs including Windows Updates are having problems behind proxy  By setting up WINHTTP will always fix this kind of problems

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This is a minor update  but since Java 7  proxy connections can now be created programmatically rather than through system properties   This may be useful if    Proxy needs to be dynamically rotated during the program s runtime Multiple parallel proxies need to be used Or just make your code cleaner      Here s a contrived example in groovy      proxy configuration read from file resource under  proxyFileName  String proxyFileName    proxy txt  String proxyPort    1234  String url    http   www promised land  File testProxyFile   new File proxyFileName  URLConnection connection  if   testProxyFile exists           logger debug  proxyFileName doesn t exist   Bypassing connection via proxy       connection   url toURL   openConnection      else       String proxyAddress   testProxyFile text     connection   url toURL   openConnection new Proxy Proxy Type HTTP  new InetSocketAddress proxyAddress  proxyPort       try       connection connect     catch  Exception e        logger error e printStackTrace       Full Reference  http   docs oracle com javase 7 docs technotes guides net proxies html

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From the Java documentation  not the javadoc API    http   download oracle com javase 6 docs technotes guides net proxies html  Set the JVM flags http proxyHost and http proxyPort when starting your JVM on the command line  This is usually done in a shell script  in Unix  or bat file  in Windows   Here s the example with the Unix shell script   JAVA FLAGS -Dhttp proxyHost 10 0 0 100 -Dhttp proxyPort 8800 java   JAVA FLAGS        When using containers such as JBoss or WebLogic  my solution is to edit the start-up scripts supplied by the vendor   Many developers are familiar with the Java API  javadocs   but many times the rest of the documentation is overlooked  It contains a lot of interesting information  http   download oracle com javase 6 docs technotes guides     Update   If you do not want to use proxy to resolve some local intranet hosts  check out the comment from  Tomalak      Also don t forget the http nonProxyHosts property    -Dhttp nonProxyHosts  localhost 127 0 0 1 10         foo com   etc

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You can set those flags programmatically this way   if  needsProxy          System setProperty  http proxyHost  getProxyHost         System setProperty  http proxyPort  getProxyPort       else       System setProperty  http proxyHost           System setProperty  http proxyPort           Just return the right values from the methods needsProxy    getProxyHost   and getProxyPort   and you can call this code snippet whenever you want

[java] How do I set the proxy to be used by the JVM

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