最近利用github action向Maven中央仓库发布企业微信SDK时会失败,从日志中发现是系统资源耗尽了,日志如下:
php
[INFO] Changes detected - recompiling the module! :dependency
[INFO] Compiling 35 source files with javac [debug target 8] to target/classes
The system is out of resources.
Consult the following stack trace for details.
java.lang.StackOverflowError
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:576)
at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2435)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:576)
at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2435)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:576)
at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2435)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:576)
at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2435)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:576)
at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2435)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:576)
at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2435)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:576)
at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2435)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:576)
at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2435)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:576)
at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2435)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:576)
at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2435)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:576)
at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2435)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:576)
at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2435)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:576)
at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2435)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:576)
at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2435)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:576)
at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2435)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:576)
at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2435)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:576)
at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2435)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:576)
at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2435)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:576)
at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2435)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:576)
at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2435)
............
编译的环境是 Java 8
应该是递归引用导致OOM了,但是仔细REVIEW了代码并没有发现问题。困扰了一个多月。今天终于解决了,问题是由下面的代码引起的:
java
public final class WecomUserAgent {
/**
* 版本号
*/
public static final String VERSION = "1.2.4";
/**
* UserAgent
*/
public static final String WECOM_USER_AGENT= "Wecom/" + VERSION + Optional.ofNullable(System.getProperty("java.version"))
.map(javaVersion -> " Java/" + javaVersion)
.orElse("");
private WecomUserAgent() {
}
}
根本的原因在于上面的静态变量WECOM_USER_AGENT
。
在Java 8 中,被标记final 的静态属性初始化时如果在字符串拼接中使用了lambda流操作,可能导致javac递归,最终堆栈溢出。该问题在Java 9 得到了修复 Bug报告:bugs.openjdk.org/browse/JDK-...
解决方法
升级JDK
升级JDK到9+ 就可以直接解决这个问题。
兼容写法
如果无法直接升级JDK,可以使用静态块来初始化:
java
public final class WecomUserAgent {
/**
* 版本号
*/
public static final String VERSION = "1.2.4";
/**
* UserAgent
*/
public static final String WECOM_USER_AGENT;
static {
WECOM_USER_AGENT = "Wecom/" + VERSION + Optional.ofNullable(System.getProperty("java.version"))
.map(javaVersion -> " Java/" + javaVersion)
.orElse("");
}
private WecomUserAgent() {
}
}