小编Bil*_*ins的帖子

开发JavaFX需要显示pdf 的桌面应用程序.我读到在JavaFX(当前版本)中不支持pdf查看/显示,我也读过JPedal.

现在,问题:

1. 是否有任何外部组件或库可以在JavaFX中查看pdf？它应该是一个免费软件.
2. (如果我必须使用JPedal)如何将其嵌入我的应用程序中.

我正面临以下错误,

java.lang.NoSuchMethodError: org.springframework.beans.factory.xml.XmlReaderContext.getEnvironment()Lorg/springframework/core/env/Environment;
    at org.springframework.context.annotation.ComponentScanBeanDefinitionParser.parse(ComponentScanBeanDefinitionParser.java:81)
    at org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:73)
    at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1423)
    at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1413)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:184)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:140)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:111)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:493)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:390)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:174)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:209)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.importBeanDefinitionResource(DefaultBeanDefinitionDocumentReader.java:239)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseDefaultElement(DefaultBeanDefinitionDocumentReader.java:196)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:181)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:140)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:111)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:493)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:390)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:174)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:209)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:180)
    at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:125)
    at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:94)
    at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:129)
    at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:537)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:452)
    at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:663)
    at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:629)
    at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:677)
    at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:548)
    at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:489)
    at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
    at javax.servlet.GenericServlet.init(GenericServlet.java:160)
    at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1280)
    at …

我正面临以下问题.我已经花了3天多的时间,但找不到解决方案.请指导我在这里做错了什么.我是野生蝇新来的Resteasy.

这是堆栈跟踪

19:05:57,610 WARN  [org.jboss.resteasy.core.ExceptionHandler] (default task-14) failed to execute: javax.ws.rs.NotFoundException: Could not find resource for full path: http://localhost:8080/admin-ws/services/user/getUser
    at org.jboss.resteasy.core.registry.ClassNode.match(ClassNode.java:73) [resteasy-jaxrs-3.0.8.Final.jar:]
    at org.jboss.resteasy.core.registry.RootClassNode.match(RootClassNode.java:48) [resteasy-jaxrs-3.0.8.Final.jar:]
    at org.jboss.resteasy.core.ResourceMethodRegistry.getResourceInvoker(ResourceMethodRegistry.java:444) [resteasy-jaxrs-3.0.8.Final.jar:]
    at org.jboss.resteasy.core.SynchronousDispatcher.getInvoker(SynchronousDispatcher.java:234) [resteasy-jaxrs-3.0.8.Final.jar:]
    at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:171) [resteasy-jaxrs-3.0.8.Final.jar:]
    at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:220) [resteasy-jaxrs-3.0.8.Final.jar:]
    at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:56) [resteasy-jaxrs-3.0.8.Final.jar:]
    at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:51) [resteasy-jaxrs-3.0.8.Final.jar:]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) [jboss-servlet-api_3.1_spec-1.0.0.Final.jar:1.0.0.Final]
    at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final]
    at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:61) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final]
    at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final]
    at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25) [undertow-core-1.0.15.Final.jar:1.0.15.Final]
    at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:113) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final]
    at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:56) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final]
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25) [undertow-core-1.0.15.Final.jar:1.0.15.Final]
    at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:45) [undertow-core-1.0.15.Final.jar:1.0.15.Final]
    at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:61) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final]
    at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:58) [undertow-core-1.0.15.Final.jar:1.0.15.Final]
    at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:70) …

我试图用FlatFileItemReader解析CSV文件.此CSV包含一些引用的换行符,如下所示.

email, name
abc@z.com, "NEW NAME
 ABC"

但是这个解析失败了,必填字段为2但实际为1.

我在FlatFileReader配置中缺少什么？

<property name="lineMapper">
            <bean class="org.springframework.batch.item.file.mapping.DefaultLineMapper">

                <!-- The lineTokenizer divides individual lines up into units of work -->
                <property name="lineTokenizer">
                    <bean
                        class="org.springframework.batch.item.file.transform.DelimitedLineTokenizer">

                        <!-- Names of the CSV columns -->
                        <property name="names"
                            value="email,name" />
                    </bean>
                </property>

                <!-- The fieldSetMapper maps a line in the file to a Product object -->
                <property name="fieldSetMapper">
                    <bean
                        class="com.abc.testme.batchjobs.util.CustomerFieldSetMapper" />
                </property>
            </bean>
        </property>

这是我的log4j.properties.

# Root logger option
log4j.rootLogger=INFO, file, stdout

# Direct log messages to a log file
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=${catalina.home}\MyLog\PmcDemo.log
log4j.appender.file.MaxFileSize=1MB
log4j.appender.file.MaxBackupIndex=1
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

# Direct log messages to stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

我正在使用tomcat 6.0,在我的应用程序中我使用了log4j中的Logger但是我没有在服务器控制台或日志文件中看到任何输出.我的应用程序使用struts2作为前端,Spring框架作为中间层,hibernate作为结束层.我没有看到我的应用程序记录如何在tomcat 6中启用它？

当我运行它时，我有如下所示的 spring 测试用例，它没有启动 Netty 服务器并提供以下异常。

Caused by: org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.context.ApplicationContextException: Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean.
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:155)

下面是我的测试用例：

@RunWith(SpringRunner.class)
@SpringBootTest(classes = SpringWebFluxDemoApplication.class, webEnvironment = SpringBootTest.WebEnvironment.DEFINED_PORT)
public class CustomPriceControllerTest {

    @Autowired
    private ApplicationContext context;

    private WebTestClient testClient;

    @Before
    public void init() {
        testClient = WebTestClient.bindToApplicationContext(context).configureClient().baseUrl("http://localhost:8080").responseTimeout(Duration.ofSeconds(30)).build();
    }

    @Test
    public void broadcastVoltageConsumption() {

        this.testClient.get().uri("/api/getCustomPrice")
                .accept(MediaType.APPLICATION_STREAM_JSON)
                .exchange()
                .expectBodyList(Custom.class)
                .consumeWith((customResults) -> {
                    List<Custom> list = CustomResults.getResponseBody();
                    Assert.assertTrue(list != null && list.size() > 0);
                }); …

我正在尝试在 IntelliJ 中调试 Nodejs + Nest 应用程序，我可以使用两种类型的配置启动该应用程序。

1. 使用Yarn（通过intellij中的NPM配置模板）
2. 使用 Node （我不确定，但是当我使用 dist 文件夹中的 main.js 时，我会得到一些调试点，但它没有用，因为它没有指向我的实际代码库）

调试器不适用于上述任何选项！

我发布了两种配置的屏幕截图。

Node + IntelliJ 的新手，所以不确定我在这两种配置中做错了什么！任何帮助，将不胜感激。

Intellij 版本是 2020.3.3 并且 NodeJS 应用程序公开了多个 API，我尝试使用 Postman 调用 API 并期望它进行调试。

下面的程序应该由两个不同的线程打印偶数和奇数但我在下面的代码中的notify方法上得到非法的监视器异常:

public class oddeven {
    static volatile Integer t = 0;

    public static void main(String as[]) {
        oddrunnable or = new oddrunnable(t);
        evenrunnable er = new evenrunnable(t);

        Thread t1 = new Thread(or, "odd");
        Thread t2 = new Thread(er, "even");

        t1.start();
        t2.start();

    }

}

class oddrunnable implements Runnable {
    Integer t;

    public oddrunnable(Integer t) {
        this.t = t;
    }

    @Override
    public void run() {
        // TODO Auto-generated method stub

        synchronized (t) {
            while (true) {

                if (t % 2 == 0) …

你好我将图像从彩色转换为纯黑色和白色,结果是一个黑暗的图像.我没理由.以下是我的代码,它受到SO上其他代码的启发.任何指导都会有所帮助.

BufferedImage coloredImage = ImageIO.read(new File("/home/discusit/ninja.png"));
BufferedImage blackNWhite = new BufferedImage(coloredImage.getWidth(),coloredImage.getHeight(),BufferedImage.TYPE_BYTE_BINARY);
Graphics2D graphics = blackNWhite.createGraphics();
graphics.drawImage(blackNWhite, 0, 0, null);

我没有得到我做错的事.使用任何其他开源库的任何更多想法都可以.

工作:::::

BufferedImage coloredImage = ImageIO.read(new File("/home/abc/ninja.png"));
BufferedImage blackNWhite = new BufferedImage(coloredImage.getWidth(),coloredImage.getHeight(),BufferedImage.TYPE_BYTE_BINARY);
Graphics2D graphics = blackNWhite.createGraphics();
graphics.drawImage(coloredImage, 0, 0, null);

ImageIO.write(blackNWhite, "png", new File("/home/abc/newBlackNWhite.png"));

我理解的部分，${user.configuredName}但我无法理解或在谷歌上找到之后的部分，:ABC谁能解释一下它的作用？我的理解是这${user.configuredName}将使用messageSource.

 <constructor-arg value="${user.configuredName:ABC}"/>