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<td id="header-avatar-image-container" valign="top" style="padding: 0px; border-collapse: collapse; vertical-align: top; width: 32px; padding-right: 9px"><a href="http://wiki.javaforum.hu/display/~auth.gabor?src=email" style="color: #3b73af; text-decoration: none"><img id="header-avatar-image" class="image_fix" src="cid:avatar_d7177d5506ab05ef431ea35647b597a3" height="32" width="32" border="0" style="border-radius: 3px; vertical-align: top" /></a></td>
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<td class="content-excerpt-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 0 24px"> <p style="margin: 10px 0 0 0; margin-top: 0">Tegnap este jó pár órát töltöttem azzal a tevékenységgel, amelyekkel a kezdő (és sokszor a haladó) fejlesztő nem számol, amikor egy feladatra becslést ad: rejtélyes hibának az okát keresi.</p> <p style="margin: 10px 0 0 0">Nem kell komoly dologra gondolni, egyszerűen elő fogok adni egy <a href="http://wiki.javaforum.hu/konferenciak.advalorem.hu/houg-2014/program" style="line-height: 1.4285715;; color: #3b73af; text-decoration: none" rel="nofollow">Java konferencián</a> <strong style="line-height: 1.4285715;">Android és JavaEE: légy REST!</strong> témában, ezért szokásomhoz híven viszonylag korán nekiálltam az előadás anyagát elkészíteni. A peremfeltételek egyszerűek voltak: egy WAR projekt, egy REST interfész, egy EJB(Lite) és persze egy JPA. Triviális dolog, a Java osztályok alig egy tucat sorosak, rajtuk kívül pedig csak egy <em style="line-height: 1.4285715;">persistence.xml</em> létrehozásából állt a feladat. A pár perc alatt (<em style="line-height: 1.4285715;">tényleg!</em>) elkészíthető demó alkalmazás azonban nem akart jól működni, a percekből negyed órák lettek, a negyed órákból órák és nagyjából fél nap után rájöttem, hogy mi okozta a fura jelenséget.</p> <p style="margin: 10px 0 0 0">Mi is volt a fura jelenség? Egyszerűen az EntityManager példány nem akart értéket kapni, akárhogy annotáltam, akárhogy hoztam létre az osztályt, tettem bele bármit, annotáltam akárhogy... nem és nem, pedig a lehető legegyszerűbb EJB osztályra kell gondolni:</p>
<div class="code panel pdl" style="border-width: 1px;">
<div class="codeContent panelContent pdl">
<pre class="theme: Confluence; brush: java; gutter: false" style="font-size:12px;; margin: 10px 0 0 0; margin-top: 0">@Stateless
public class TokenService {
@PersistenceContext
private EntityManager em;
public final String validate(final String token) {
System.out.println(em);
}
}</pre>
</div>
</div> <p style="margin: 10px 0 0 0">A WildFly szó nélkül telepítette, elindította, a Hibernate szépen felismerte az entitásokat, létrehozta a sémát, elindult minden, lett JNDI bejegyzés, lett REST interfész is (másik osztályból), csak éppen az <em>em</em> értéke <em>null</em> maradt, hiba sehol, naplófájlokban semmi nyom (na jó, TRACE szintet nem kapcsoltam be). Az alábbi EJB osztály viszont működik:</p>
<div class="code panel pdl" style="border-width: 1px;">
<div class="codeContent panelContent pdl">
<pre class="theme: Confluence; brush: java; gutter: false" style="font-size:12px;; margin: 10px 0 0 0; margin-top: 0">@Stateless
public class TokenService {
@PersistenceContext
private EntityManager em;
public String validate(final String token) {
System.out.println(em);
}
}</pre>
</div>
</div> <p style="margin: 10px 0 0 0">Kérem szépen tisztelettel: értem én, hogy ez a <em style="line-height: 1.4285715;">final</em> módosító a metóduson nem engedélyezett <em style="line-height: 1.4285715;">no-interface view</em> esetén, mivelhogy a specifikáció ezt írja: "<em style="line-height: 1.4285715;"><span style="line-height: 1.4285715;">All methods exposed through the no-interface view must not be declared final."</span></em> </p> <p style="margin: 10px 0 0 0"> <em style="line-height: 1.4285715;"><span style="line-height: 1.4285715;"> </span></em>De hogy az alkalmazásszerver ennek ellenére rendben elindítja az EJB-t, szépen működik is minden a naplóbejegyzések szerint... kivéve, hogy nem végzi el az injection-t: az most <strong style="line-height: 1.4285715;">bug</strong> vagy <strong style="line-height: 1.4285715;">feature</strong>? <img class="emoticon emoticon-smile" src="http://wiki.javaforum.hu/s/en_GB-1988229788/4727/ffd10e10ff7bc0a1d7e29b4d2225707dd7f03d0b.13/_/images/icons/emoticons/smile.png" data-emoticon-name="smile" alt="(smile)" style="vertical-align: middle" /></p> </td>
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