小编Ioa*_*oan的帖子

我正在开发一个应用程序,我已经开始使用CDI沿JSF和JPA.Web容器是Tomcat.

我EntityManager对我的CDI豆子里的生命周期非常困惑,我需要一个很好的建议来清除我心中的一些东西.一般来说,我读过的是EntityManager主要应该在Java EE容器中使用,使用PersistenceContext注释注入它.因此,容器会照顾它的生命.但是,如果你不使用Java EE容器(as Tomcat),那么我需要管理我EntityManager的生活.

使用哪个是我最好的选择Tomcat, CDI, JSF and JPA？我现在正在做的是以下内容:

public class EntityManagerFactoryProducer {

    public static final String TEST = "test";

    @Produces
    @ApplicationScoped
    public EntityManagerFactory create() {
        return Persistence.createEntityManagerFactory(TEST);
    }

    public void destroy(@Disposes
    EntityManagerFactory factory) {
        factory.close();
    }
}

public class EntityManagerProducer {

    @Inject
    private transient Logger logger;

    @Inject
    private EntityManagerFactory emf;

    @Produces
    public EntityManager …

我有一个String作为参数(实际上是一个valueOf(一个整数),并希望将它与DB中的int值的子字符串进行比较.这是我的代码:

ClinicPatients clp = null;

// Get the criteria builder instance from entity manager
final CriteriaBuilder cb = getEntityManager().getCriteriaBuilder();     
// Create criteria query and pass the value object which needs to be populated as result
CriteriaQuery<ClinicPatients> criteriaQuery = cb.createQuery(ClinicPatients.class);     
// Tell to criteria query which tables/entities you want to fetch
final Root<ClinicPatients> rootClp = criteriaQuery.from(ClinicPatients.class);

criteriaQuery.select(rootClp);

Expression<String> e1 = cb.function("CONVERT", String.class, rootClp.get(idCPFieldName));

Predicate p1 = cb.equal(cb.substring(e1, 1, 3), idClinicPatient);
criteriaList.add(p1);

criteriaQuery.where(p1);

// Here entity manager will …

当我尝试使用primefaces cropper裁剪图像时出现以下错误,但图像上没有选择任何内容(选择不存在):

2013年3月17日下午5:10:46 com.sun.faces.lifecycle.ProcessValidationsPhase执行警告:负宽度或零宽度

java.awt.image.RasterFormatException: negative or zero width
        at java.awt.image.Raster.<init>(Raster.java:1108)
        at java.awt.image.WritableRaster.<init>(WritableRaster.java:129)
        at sun.awt.image.SunWritableRaster.<init>(SunWritableRaster.java:129)
        at sun.awt.image.ByteComponentRaster.<init>(ByteComponentRaster.java:154)
        at sun.awt.image.ByteInterleavedRaster.<init>(ByteInterleavedRaster.java:191)
        at sun.awt.image.ByteInterleavedRaster.createWritableChild(ByteInterleavedRaster.java:1261)
        at java.awt.image.BufferedImage.getSubimage(BufferedImage.java:1173)
        at org.primefaces.component.imagecropper.ImageCropperRenderer.getConvertedValue(ImageCropperRenderer.java:146)
        at javax.faces.component.UIInput.getConvertedValue(UIInput.java:1030)
        at javax.faces.component.UIInput.validate(UIInput.java:960)
        at javax.faces.component.UIInput.executeValidate(UIInput.java:1233)
        at javax.faces.component.UIInput.processValidators(UIInput.java:698)
        at com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback.visit(PartialViewContextImpl.java:510)
        at com.sun.faces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:183)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1612)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)
        at …

我正在使用JSF 2.2,Primefaces 4.0而且我正在使用slider来自的组件Primefaces.

<p:slider displayTemplate="Between {min} and {max}" minValue="20" maxValue="40" step="1"/>

我想问你,如果是不可能性有step作为decimal的价值.例如step="0.1",或者也许是关于如何解决这个问题的一些想法.

我试过但我得到的错误如下:

javax.el.ELException: Cannot convert 0.1 of type class java.lang.String to int] with root cause

谢谢.

是否可以设置当前显示的标签编程的<p:wizard>？

例如,我想要对包含向导的同一页面的两个不同请求,以选择不同的选项卡.

我目前正在尝试做的是,有一个带有许多选项卡的向导,在第二个选项卡中我有一个重定向到另一个页面,所以当我回来时,我想进入导致重定向的最后一步.

你能帮我么 ？非常感谢 !

如果此方法被commandButton组件作为AJAX请求调用,并且该方法是在托管bean的实例变量上运行,那么我们是否必须同步托管bean方法？

假设我们有这个简单的托管bean:

public class ManagedBeanTest {

  private int count;

  public int getCount() {
    return count;
  }

  public void setCount(int count) {
    this.count = count;
  }

  public String increaseCount() {
    count++;
    return null;
  }

}

因此,如果在这种情况下该increaseCount方法由commandButton内部组件调用action,我是否必须同步此方法？

谢谢您的回答.

我正在尝试触发POST请求。我发送的数据是XML格式的（我通过JAXB进行此操作），但是我必须发送请求参数。我的问题与Content-Type有关（我在代码中添加了一些注释）。我应该使用哪一个？

见下面我的代码：

       private V callAndGetResponse(K request, Class<K> requestClassType, Class<V> responseClassType) throws Exception {
    JAXBContext jaxbContext = JAXBContext.newInstance(requestClassType, responseClassType);

    Marshaller marshaller = jaxbContext.createMarshaller();
    // set properties on marshaller
    marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
    marshaller.setProperty(Marshaller.JAXB_ENCODING, charset);
    marshaller.setProperty("com.sun.xml.internal.bind.xmlHeaders", String.format(XML_HEADER_FORMAT, dtd));
    marshaller.marshal(request, System.out);

    URL wsUrl = new URL(primaryEndpointUrl);
    HttpURLConnection connection = openAndPrepareConnection(wsUrl);
    tryToMarshallWsRequestToOutputStream(request, marshaller, connection);

    printDebug(connection);

    Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
    Object response = unmarshaller.unmarshal(connection.getInputStream());

    // cleanup
    connection.disconnect();
    return responseClassType.cast(response);
}

private HttpURLConnection openAndPrepareConnection(URL wsUrl) throws IOException {
    HttpURLConnection connection = (HttpURLConnection) wsUrl.openConnection();
    connection.setDoOutput(true);
    connection.setRequestProperty("Accept", "application/xml"); …