java - Eclipse:未调用 javax.annotation PostConstruct

Question

我正在使用 Fedora 29，并尝试通过创建一个新的插件项目并使用“使用 4.X API 查看贡献”模板来尝试一个简单的插件示例。

我提供了以下系统属性:

-Dorg.eclipse.e4.core.di.debug=true

在我的 eclipse 下的 VM 参数中。

启用该调试后，我收到以下消息:

!MESSAGE Possbible annotation mismatch: method "public void hello.parts.SampleView.createPartControl(org.eclipse.swt.widgets.Composite)" annotated with "javax.annotation-api:1.2.0:javax.annotation.PostConstruct" but was looking for "javax.annotation.PostConstruct [via bootstrap classloader]"

此错误消息是什么意思以及如何解决它？

这里是包含 PostConstruct 注释的 eclipse 插件示例的片段。

import javax.annotation.PostConstruct;
import javax.inject.Inject;
import javax.inject.Named;
import org.eclipse.e4.core.di.annotations.Optional;
import org.eclipse.e4.ui.di.Focus;
import org.eclipse.e4.ui.services.IServiceConstants;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;

public class SampleView {
    private Label myLabelInView;

    @PostConstruct
    public void createPartControl(Composite parent) {
        System.out.println("Enter in SampleE4View postConstruct");

        myLabelInView = new Label(parent, SWT.BORDER);
        myLabelInView.setText("This is a sample E4 view");

    }

编辑:

Manifest.mf 文件:

Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: Hello
Bundle-SymbolicName: hello;singleton:=true
Bundle-Version: 1.0.0.qualifier
Require-Bundle: javax.inject,
 org.eclipse.osgi,
 org.eclipse.jface,
 org.eclipse.e4.ui.model.workbench,
 org.eclipse.e4.ui.di,
 org.eclipse.e4.ui.services,
 org.eclipse.e4.core.di.annotations
Bundle-RequiredExecutionEnvironment: JavaSE-1.8
Automatic-Module-Name: hello
Import-Package: javax.annotation

编辑2:

在检查了 javax.annotation 的 jar 后(它被称为 javax.annotation-api 而不是 javax.annotation...)，我发现它们有一个到 glassfish 实现的符号链接(symbolic link):

/usr/lib/eclipse/plugins/javax.annotation-api_1.2.0.jar -> /usr/share/java/glassfish-annotation-api.jar
/usr/lib/eclipse/plugins/javax.el-api_3.0.0.jar -> /usr/share/java/glassfish-el-api.jar
/usr/lib/eclipse/plugins/javax.inject_1.0.0.v20091030.jar -> /usr/share/java/atinject.jar
/usr/lib/eclipse/plugins/javax.servlet-api_3.1.0.jar -> /usr/share/java/glassfish-servlet-api.jar
/usr/lib/eclipse/plugins/javax.servlet.jsp_2.3.2.b01.jar -> /usr/share/java/glassfish-jsp-api/javax.servlet.jsp-api.jar

Answer 1

Import-Package 似乎选择了错误的插件。还应该有一个正确的 javax.annotation 插件。尝试将 javax.annotation 添加到 Require-Bundle 列表中以强制使用它:

Require-Bundle: javax.inject,
 javax.annotation,
 org.eclipse.osgi,
 org.eclipse.jface,
 org.eclipse.e4.ui.model.workbench,
 org.eclipse.e4.ui.di,
 org.eclipse.e4.ui.services,
 org.eclipse.e4.core.di.annotations