基于axtavt的答案,这几乎肯定是Notebean和NoteBean之间的命名问题.这里有一个特定的惯例,只是正常的CamelCase吗？
我相信我已经更新了实体中的@NamedQuery注释,并且正在使用来自控制器的注释,并且名称看起来匹配,但我仍然收到关于模式的相同错误,我无法获得更多信息上.
JPA控制器:
package net.bounceme.dur.nntp.controller;
import java.util.*;
import java.util.logging.Logger;
import javax.mail.Message;
import javax.persistence.*;
import javax.swing.DefaultListModel;
import net.bounceme.dur.nntp.model.NoteBean;
public class NotesController {
private static final long serialVersionUID = 1L;
private static final Logger LOG = Logger.getLogger(NotesController.class.getName());
private Message message;
private List<NoteBean> notes = new ArrayList<NoteBean>();
private DefaultListModel defaultListModel = new DefaultListModel();
private EntityManagerFactory emf;
private EntityManager em;
private String PERSISTENCE_UNIT_NAME = "nntpPU";
public NotesController() {
emf = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME);
em = emf.createEntityManager();
LOG.info("entity manager made???" + em.isOpen());
populateList();
}
private void populateList() …我不明白文档：
\n\n\n\n\n包级函数
\n\n包 org.foo.bar 内的 example.kt 文件中声明的所有函数和属性（包括扩展函数）都被编译为名为 org.foo.bar.ExampleKt 的 Java 类的静态方法。
\n
// example.kt\npackage demo\n\nclass Foo\n\nfun bar() {\n}\n\n// Java\nnew demo.Foo();\ndemo.ExampleKt.bar();\n我的代码如下。
\n\n编译错误；构建失败：
\n\nthufir@dur:~/NetBeansProjects/kotlin$ \nthufir@dur:~/NetBeansProjects/kotlin$ gradle compileJava\n\n> Task :compileJava\n/home/thufir/NetBeansProjects/kotlin/src/main/java/net/bounceme/dur/kotlin/App.java:12: error: package demo does not exist\n new demo.Foo();\n ^\n/home/thufir/NetBeansProjects/kotlin/src/main/java/net/bounceme/dur/kotlin/App.java:13: error: package demo does not exist\n demo.ExampleKt.bar();\n ^\n2 errors\n\n\nFAILURE: Build failed with an exception.\n\n* What went wrong:\nExecution failed for task \':compileJava\'.\n> Compilation failed; see the compiler error output for details.\n\n* Try:\nRun with --stacktrace option …我知道有两种方法可以"漂亮地打印"或格式化xml:
shell工具 Hack 38 Pretty-Print XML使用通用标识样式表和Xalan
有什么其他免费(如啤酒)格式化器？(除了使用javascript)
我已经更新了问题,以便两个表现在都使用自动增量.可能是持久化到MESSAGES表中数据库模式问题的问题？
在尝试持久化MessageBean时:
private void persist(MessageBean messageBean) throws Exception {
LOG.info("loading.." + messageBean);
Messages message = new Messages(messageBean);
emf = Persistence.createEntityManagerFactory("USENETPU");
em = emf.createEntityManager();
em.getTransaction().begin();
em.persist(message);
em.getTransaction().commit();
}
堆栈跟踪:
run:
Jul 27, 2012 3:04:06 PM net.bounceme.dur.usenet.controller.CommentsDefaultListModel persist
INFO: loading..floor installer (cultas lake)
[EL Info]: 2012-07-27 15:04:10.006--ServerSession(30409723)--EclipseLink, version: Eclipse Persistence Services - 2.3.0.v20110604-r9504
[EL Info]: 2012-07-27 15:04:11.78--ServerSession(30409723)--file:/home/thufir/NetBeansProjects/USENET/build/classes/_USENETPU login successful
[EL Warning]: 2012-07-27 15:04:12.072--ClientSession(29574192)--Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.3.0.v20110604-r9504): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'nntp.SEQUENCE' doesn't exist
Error …哪个是首选,provided或者provided group在哪里记录？
thufir@doge:~/NetBeansProjects/gradleEAR$
thufir@doge:~/NetBeansProjects/gradleEAR$ gradle clean
FAILURE: Build failed with an exception.
* Where:
Build file '/home/thufir/NetBeansProjects/gradleEAR/build.gradle' line: 40
* What went wrong:
A problem occurred evaluating root project 'gradleEAR'.
> Could not find method provided() for arguments [javax:javaee-api:7.0] on object of type org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler.
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
BUILD FAILED
Total time: 2.991 secs …我从XSD(使用JAXB)进行代码生成.我有一个超类和几个子类.其中一个超类'属性(比如说prop),有类型A.我也有类型B extends A和C extends A(在XSD中定义).超类'模式定义了一个类型的元素A,它由子类继承.我想使用类型B而C不是A子类.
<xsd:complexType name="Superclass">
<xsd:sequence>
<xsd:element name="prop" type="A" maxOccurs="unbounded"/>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="Subclass1">
<xsd:complexContent>
<xsd:extension base="Superclass"/>
<xsd:attribute name="someAttribute" type="xsd:string"/>
</xsd:complexContent>
</xsd:complexType>
<xsd:complexType name="Subclass2">
<xsd:complexContent>
<xsd:extension base="Superclass"/>
<xsd:attribute name="someOtherAttribute" type="xsd:int"/>
</xsd:complexContent>
</xsd:complexType>
生成的Superclass.java将有List<A> prop.例如,我想prop同类型被覆盖List<B>在Subclass1.java与List<C>中Subclass2.java.主要目标是prop在超类中使用,但在子类中使用其他(兼容)类型.
使用PowerShell如何设置的环境变量（在这里，特别是“ApiSecret”），以便printenv将表现出必要的变量？
（假设问题在于 Visual Studio 和 bash 没有正确获取环境变量。它们可以很容易地从 bash 设置。）
我在 Linux 上：
thufir@dur:~/powershell/helloPSTwitterAPI$
thufir@dur:~/powershell/helloPSTwitterAPI$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.10
Release: 18.10
Codename: cosmic
thufir@dur:~/powershell/helloPSTwitterAPI$
电源外壳代码：
Import-Module PSTwitterAPI
Set-TwitterOAuthSettings -ApiKey $env:ApiKey -ApiSecret $env:ApiSecret -AccessToken $env:AccessToken -AccessTokenSecret $env:AccessTokenSecret
#Get-TwitterUsers_Lookup -screen_name 'mkellerman'
$TwitterStatuses = Get-TwitterStatuses_UserTimeline -screen_name 'mkellerman'
#$TwitterStatuses = [array]Get-TwitterStatuses_UserTimeline -screen_name 'mkellerman'
Foreach ($status in $TwitterStatuses) {
Write-Host $status.text
}
Write-Host "done"
视觉工作室代码：
PS /home/thufir> …bash powershell environment-variables visual-studio .net-core
println在kotlin函数之前放置一个语句会返回崩溃.堆栈跟踪:
thufir@dur:~/NetBeansProjects/kotlin$
thufir@dur:~/NetBeansProjects/kotlin$ gradle clean build --stacktrace
w: Classpath entry points to a non-existent location:
e: /home/thufir/NetBeansProjects/kotlin/src/main/kotlin/example.kt: (14, 5): Unresolved reference: println
> Task :compileKotlin
Using Kotlin incremental compilation
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':compileKotlin'.
> Compilation error. See log for more details
* Try:
Run with --info or --debug option to get more log output.
* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':compileKotlin'.
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:100)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:70)
at …如何应用插件来JavaFX使用 Kotlin DSL？手册建议：
apply plugin: 'org.openjfx.javafxplugin'
而我使用的是 Gradle Kotlin DSL，而不是普通的 Gradle。
当前错误：
thufir@dur:~/NetBeansProjects/helloWorldJavaFX$
thufir@dur:~/NetBeansProjects/helloWorldJavaFX$ gradle clean
> Configure project :
e: /home/thufir/NetBeansProjects/helloWorldJavaFX/build.gradle.kts:15:5: Unresolved reference: javafxplugin
FAILURE: Build failed with an exception.
* Where:
Build file '/home/thufir/NetBeansProjects/helloWorldJavaFX/build.gradle.kts' line: 15
* What went wrong:
Script compilation error:
Line 15: javafxplugin
^ Unresolved reference: javafxplugin
1 error
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. …为了用于cat输出*.txt特定目录中的文件，如何在每个文件之前插入文件名作为“中断”？
file #1
contents of file
file #2
contents of file
理想情况下，作为易于记住的几个bash命令。
也可以看看：