小编Mut*_*thu的帖子

当我在Windows 和 Mac上使用 jasper 报告时，它工作正常，当我将应用程序部署到Linux 机器并尝试生成它抛出的报告时，它工作正常

net.sf.jasperreports.engine.util.JRFontNotFoundException: Font 'Times New Roman' is not available to the JVM. See the Javadoc for more details.

我知道我们可以通过在 Linux 机器上安装缺少的字体来解决这个问题（http://stackoverflow.com/questions/3987804/jasper-stops-finding-one-font）。我的问题是，我们可以将字体打包为 jar 并与应用程序一起作为包提供。这个怎么做 ？

我是hibernate的新手,我在这个网站上有一些疑问和澄清(一对多的关系和其他对象的关系).

对于相同的应用程序,我面临着不同的问题.例外是,我在这个应用程序中缺少的.

Hibernate: insert into TestDB.customer (name, registrationDate) values (?, ?)
Hibernate: insert into TestDB.tickets (accessories, comments, uid, problem, problemFiledDate, repairTye, status, statusChangedDate) values (?, ?, ?, ?, ?, ?, ?, ?)
Exception in thread "main" java.lang.NullPointerException
    at org.hibernate.tuple.entity.AbstractEntityTuplizer.getPropertyValue(AbstractEntityTuplizer.java:521)
    at org.hibernate.persister.entity.AbstractEntityPersister.getPropertyValue(AbstractEntityPersister.java:3867)
    at org.hibernate.id.ForeignGenerator.generate(ForeignGenerator.java:100)
    at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:121)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:117)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
    at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:685)
    at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:677)
    at org.hibernate.engine.CascadingAction$5.cascade(CascadingAction.java:252)
    at org.hibernate.engine.Cascade.cascadeToOne(Cascade.java:392)
    at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:335)
    at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:204)
    at org.hibernate.engine.Cascade.cascade(Cascade.java:161)
    at org.hibernate.event.def.AbstractSaveEventListener.cascadeAfterSave(AbstractSaveEventListener.java:475)
    at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:353)
    at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:203)
    at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:129)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
    at …

当我使用以下代码检索信息时,它显示错误..

var mails = from m in entity.mailboxes
            join p in entity.ordinary_user_profile_info on m.from_id equals p.user_id
            select new MailList
            {
                mid = m.m_id,
                mfrom = m.**from_id,** // Error occours here
                mfomname = p.username,
                msubject = m.subject
            };

错误是:

"int？mailbox.from_id"

无法隐式转换类型'int？' 'int'.存在显式转换(您是否错过了演员？)

我在DB和MailList类中声明了m_id和from_idint.

我有容器div元素,高度为100%.该ButtonGroup的 div元素在JSP填充,它可以包含多个按钮,所以它的高度将动态地增长.

在buttonGroup div元素占用一定高度后,应将剩余高度分配给displayArea div元素.如何在css3中执行此操作？设计应该响应.

<div id="container" style="height: 100%;">
      <div id="buttonGroup">
             <input id="testbtn" type="button" value="Test">
      </div>
      <div id="dislayArea">
          ------ data ------
      </div>
</div>