Sebastian Thomschke

IT Berater – Java, J2EE, WebSphere Portal, Lotus Domino
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  • OVal 1.40 released

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    Posted on 28 September 2009 Sebastian Thomschke*/?> No comments

    I am happy to announce the immediate availability of Version 1.40 OVal the Object Validation Framework for Java. This release fixes some minor issues and provides the following two new features:

    1. Enabling/disabling constraints based on the object state:
    Using the newly introduced when attribute for constraints it is possible to specify under which circumstances the constraint will be considered during object validation. The when attribute holds a formula in one of the supported scripting languages. If the formula returns true, the constraint will be activated for the current validation cycle otherwise it is ignored. In the following example the alias attribute must have a value only when the name attribute is not set.

    public class User {
       private String name;
    
       @NotNull(when = "groovy:_this.name == null")
       private String alias;
    
       // . . .
    }
    

    2. Fine grain control over how constraints are applied on arrays, maps, collections and their elements
    The newly introduced attribute appliesTo allows you to specify if and how a constraint declared for a map, a collection or an array is applied to their elements as well or exclusively. See the following example how this works:

    public class BusinessObject {
    
       // the ids field may be null, but if it is not null 
       // none of it's items must be null
       @NotNull(appliesTo = { ConstraintTarget.VALUES })
       private String[] ids;
    
       // only the field itself must not be null,
       // the list can contain null values
       @NotNull(appliesTo = { ConstraintTarget.CONTAINER })
       private List items;
    
       // the field must not be null as well as all keys 
       // and values of the map
       @NotNull(appliesTo = { ConstraintTarget.CONTAINER, ConstraintTarget.KEYS, ConstraintTarget.VALUES })
       private Map itemsByGroup;
    
       // . . .
    }
    

    Download
    You can get the latest binaries and source files of OVal from here: http://sourceforge.net/projects/oval/files/

  • Installing WebSphere Portal in a local network

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    Posted on 6 July 2009 Sebastian Thomschke*/?> 4 comments

    Recently I had to setup some WebSphere Portal 6.1 installations in VMWares within a private network. Unfortunately the portal installer aborted with the following message “EJPIC0067E: Portal requires a fully qualified host name that is recoganized by the DNS Server.” Even when adding the fully qualified hostname to the hosts file the installer may still fail with the same message.
    The workaround is to disable the hostname check by invoking the portal installer with the following parameter specified: -W nodeHost.active=”False”. You should however only do this for test or development installations.

  • Comparing version numbers in Jython / Python

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    Posted on 14 March 2009 Sebastian Thomschke*/?> No comments

    Here comes a function to compare version numbers of e.g. Maven artifacts in Jython / Python.

    import re
    
    def cmpver(vA, vB):
        """
        Compares two version number strings
        @param vA: first version string to compare
        @param vB: second version string to compare
        @author Sebastian Thomschke
        @return negative if vA < vB, zero if vA == vB, positive if vA > vB.
       
        Examples:
        >>> cmpver("0", "1")
        -1
        >>> cmpver("1", "0")
        1
        >>> cmpver("1", "1")
        0
        >>> cmpver("1.0", "1.0")
        0
        >>> cmpver("1.0", "1")
        0
        >>> cmpver("1", "1.0")
        0
        >>> cmpver("1.1.0", "1.0.1")
        1
        >>> cmpver("1.0.1", "1.1.1")
        -1
        >>> cmpver("0.3-SNAPSHOT", "0.3")
        -1
        >>> cmpver("0.3", "0.3-SNAPSHOT")
        1
        >>> cmpver("1.3b", "1.3c")
        -1
        >>> cmpver("1.14b", "1.3c")
        1
        """
        if vA == vB: return 0
    
        def num(s): 
            if s.isdigit(): return int(s)
            return s
    
        seqA = map(num, re.findall('\d+|\w+', vA.replace('-SNAPSHOT', '')))
        seqB = map(num, re.findall('\d+|\w+', vB.replace('-SNAPSHOT', '')))
    
        # this is to ensure that 1.0 == 1.0.0 in cmp(..)
        lenA, lenB = len(seqA), len(seqB)
        for i in range(lenA, lenB): seqA += (0,) 
        for i in range(lenB, lenA): seqB += (0,)
        
        rc = cmp(seqA, seqB)
        
        if rc == 0:
            if vA.endswith('-SNAPSHOT'): return -1
            if vB.endswith('-SNAPSHOT'): return 1
        return rc
    

    Theoretically lines 43 – 49 could be written in a more compact way but using the short circuit evaluations (as below) lead to wrong results – at least in Jython 2.1:

        seqa = map(lambda s: s.isdigit() and int(s) or s, re.findall('\d+|\w+', vA.replace('-SNAPSHOT', '')))
        seqb = map(lambda s: s.isdigit() and int(s) or s, re.findall('\d+|\w+', vB.replace('-SNAPSHOT', '')))
    
  • Running TomCat 6 in Debug Mode under Windows

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    Posted on 11 March 2009 Sebastian Thomschke*/?> 2 comments

    While tracing some problems in one of my grails applications I had the need to do step debugging on a remote Tomcat server. Eventually I came up with the following lines to launch TomCat in debug mode:

    @echo off
    set JPDA_TRANSPORT="dt_socket"
    set JPDA_ADDRESS="8000"
    set JPDA_SUSPEND="y"
    catalina.bat jpda start
    

    Simply create a debug.bat file in TomCat’s bin directory and add these lines.

  • Determine the user who logged on via SSH

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    Posted on 23 February 2009 Sebastian Thomschke*/?> No comments

    Today we had the need to determine the initial id of a user who logged onto a Linux box via SSH and executed the su command. When the su command is issued the effective user is changed and whoami or id commands will report that new user id instead.

    For anyone who is interested, that is what we came up to put the initial user id into a variable named ${LOGIN_USER}

    LOGIN_USER=`who -m`; LOGIN_USER=${LOGIN_USER%% *}

    or alternatively

    LOGIN_USER=`who -m | cut -d' ' -f1`
  • Lotus Notes [Send only] und [Send and File] Schaltflächen für Outlook 2003

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    Posted on 19 February 2009 Sebastian Thomschke*/?> 24 comments

    Man kann über Lotus Notes sagen was man möchte, wenn man damit eine Weile gearbeitet hat und auf z.B. Outlook umgestiegen ist/wurde, dann fehlt einem in der Regel doch die eine oder andere liebgewonnene Funktion.

    Da ich nun bereits bei meinem zweiten Kunden “gezwungen” bin, mit MS Outlook 2003 zu arbeiten und mich scheinbar auch in Zukunft nicht um dessen Verwendung drücken kann, habe ich zwei der vielen praktische Notes-Funktionen für Outlook 2003 implementiert:

    1. Die Schaltfläche [Send only], bzw. [Nur senden] versendet eine E-Mail ohne eine Kopie davon in Outlook zu speichern.
    2. Die Schaltfläche [Send and File…] bzw. [Senden und ablegen…] erfragt vor dem Versenden in welchem Ordner die gerade geschriebene E-Mail abgelegt werden soll.

    Installation:

    1. Download des Visual Basic Moduls in der gewünschten Sprache.

        Send Mail Macros for MS Outlook 2003 (EN) (4.9 KiB, 4,077 hits)

        Send Mail Macros for MS Outlook 2003 (DE) (5.1 KiB, 2,384 hits)


    2. In Outlook den Visual Basic Editor öffnen.

      open VBE from within outlook

    3. Das Visual Basic Modul importieren

      Modul importieren Das VBE Modul auswählen Das VBE Modul wurde importiert.

    4. Das Projekt speichern.

      Das VBE Projekt speichern

    5. Die Schaltflächen in der Toolbar installieren.

      Makros Dialog öffnen
      Schaltfläche [Senden und ablegen...] installieren
      Schaltfläche [Senden und ablegen...] installiert
      Schaltfläche [Nur senden] installieren
      Schaltfläche [Nur senden] installiert

    6. Beim Erstellen einer neuen E-Mail sollten nun in der Toolbar die beiden zusätzlichen Schaltflächen angezeigt werden.

      Neue Schaltflächen in der Toolbar

    7. Beim Klick auf “Senden und ablegen…” erscheint vor dem Versenden der Ordnerdialog.

      Auswahl des Zielordners