当我在视图上使用 @Push 注释时，出现以下异常（JDK 16、Vaadin 19.0.7、Spring boot 2.4.7）：
org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:162) ~[spring-boot-2.4.7-20210610.075414-42.jar:2.4.7-SNAPSHOT]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:577) ~[spring-context-5.3.8.jar:5.3.8]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144) ~[spring-boot-2.4.7-20210610.075414-42.jar:2.4.7-SNAPSHOT]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:771) ~[spring-boot-2.4.7-20210610.075414-42.jar:2.4.7-SNAPSHOT]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:763) ~[spring-boot-2.4.7-20210610.075414-42.jar:2.4.7-SNAPSHOT]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:438) ~[spring-boot-2.4.7-20210610.075414-42.jar:2.4.7-SNAPSHOT]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:339) ~[spring-boot-2.4.7-20210610.075414-42.jar:2.4.7-SNAPSHOT]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1329) ~[spring-boot-2.4.7-20210610.075414-42.jar:2.4.7-SNAPSHOT]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1318) ~[spring-boot-2.4.7-20210610.075414-42.jar:2.4.7-SNAPSHOT]
at net.cbsolution.chameleon.ChameleonApplication.main(ChameleonApplication.java:10) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:567) ~[na:na]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.4.7-20210610.075414-42.jar:2.4.7-SNAPSHOT]
Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:142) ~[spring-boot-2.4.7-20210610.075414-42.jar:2.4.7-SNAPSHOT]
at …处理 IText XMLWorker 中的嵌入图像。
有没有办法在 XMLWorker 中处理嵌入式（Base64）图像？在 5.3.5 版本中，我使用的 ImageProvider 不再起作用（之前引发了异常），因此我按如下方式修补了 ImageRetrieve，但显然这将在下一次 XMLWorker 更新中被破坏：
package com.itextpdf.tool.xml.net;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import com.itextpdf.text.BadElementException;
import com.itextpdf.text.Image;
import com.itextpdf.text.pdf.codec.Base64;
import com.itextpdf.tool.xml.net.exc.NoImageException;
import com.itextpdf.tool.xml.pipeline.html.ImageProvider;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* @author redlab_b
*
*/
public class ImageRetrieve {
final static Pattern INLINE_PATTERN = Pattern.compile("^/data:image/(png|jpg|gif);base64,(.*)");
private final ImageProvider provider;
/**
* @param imageProvider the provider to use.
*
*/
public ImageRetrieve(final ImageProvider imageProvider) {
this.provider = imageProvider;
}
/**
*
*/
public ImageRetrieve() …我正在尝试包含本文中所述的自定义图标 。但我找不到@HtmlImport注释了（Flow V.20）。这个注释被广泛使用，如果它被替换，我希望至少能找到一些文档。
PS我也尝试@StyleSheet("./styles/iconexp-iconset-svg.html")
过它抱怨：
Couldn't find route for 'styles/iconexp-iconset-svg.html'