java开发常见问题

文章目录
  1. 1. maven仓库地址证书过期
maven仓库地址证书过期
问题:在idea中创建了一个maven项目,在pom文件中引入几个依赖。但是这几个依赖包一直下载不下来,提示下载失败。
排查问题:
1. 推断可能是maven哪里配置出现了问题,下载失败肯定会有日志记录。
2. idea菜单的 help -> show log in explore 会直接跳转到idea日志目录。
3. 查看idea.log文件。
4. 该日志文件中出现如下的日志信息。

Caused by: java.lang.RuntimeException: org.eclipse.aether.transfer.ArtifactTransferException: Failure to transfer org.springframework:spring-context:pom:5.1.8.RELEASE from http://maven.aliyun.com/nexus/content/groups/public/ was cached in the local repository, resolution will not be reattempted until the update interval of datanucleus has elapsed or updates are forced. Original error: Could not transfer artifact org.springframework:spring-context:pom:5.1.8.RELEASE from/to datanucleus (http://maven.aliyun.com/nexus/content/groups/public/): sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
5. 该信息显示无法找到合法的证书。
解决:为该站点生成证书信息-> 运行下面的java类,然后在控制台输入1,会在该类所在项目路径下生成一个证书,文件名为 ssecacerts。 将该文件拷贝到 $JAVA_HOME/jre/lib/security 目录下。
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.security.KeyStore;
import java.security.MessageDigest;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;

public class InstallCert {
public static final String HOSTNAME = "repo.maven.apache.org";

public static void main(String[] args) throws Exception {
args = new String[]{HOSTNAME};
String host;
int port;
char[] passphrase;
if ((args.length == 1) || (args.length == 2)) {
String[] c = args[0].split(":");
host = c[0];
port = (c.length == 1) ? 443 : Integer.parseInt(c[1]);
//java keytool默认的密码是changeit
String p = (args.length == 1) ? "changeit" : args[1];
passphrase = p.toCharArray();
} else {
System.out.println("Usage: java InstallCacerts <host>[:port] [passphrase]");
return;
}

File file = new File("jssecacerts");
if (file.isFile() == false) {
File dir = new File(System.getProperty("java.home") + File.separatorChar + "lib" + File.separatorChar + "security");
//先看默认的证书库jssecacerts是否存在
file = new File(dir, "jssecacerts");
//如果不存在则使用cacerts(它随J2SDK一起发行,含有数量有限的可信任的基本证书)
if (file.isFile() == false) {
file = new File(dir, "cacerts");
}
}
System.out.println("Loading KeyStore " + file + "...");
InputStream in = new FileInputStream(file);
KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
ks.load(in, passphrase);
in.close();

SSLContext context = SSLContext.getInstance("TLS");
TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
tmf.init(ks);
X509TrustManager defaultTrustManager = (X509TrustManager) tmf.getTrustManagers()[0];
SavingTrustManager tm = new SavingTrustManager(defaultTrustManager);
context.init(null, new TrustManager[]{tm}, null);
SSLSocketFactory factory = context.getSocketFactory();

System.out.println("Opening connection to " + host + ":" + port + "...");
SSLSocket socket = (SSLSocket) factory.createSocket(host, port);
socket.setSoTimeout(10000);
try {
System.out.println("Starting SSL handshake...");
socket.startHandshake();
socket.close();
System.out.println();
System.out.println("No errors, certificate is already trusted");
} catch (SSLException e) {
System.out.println();
e.printStackTrace(System.out);
}

X509Certificate[] chain = tm.chain;
if (chain == null) {
System.out.println("Could not obtain server certificate chain");
return;
}

BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

System.out.println();
System.out.println("Server sent " + chain.length + " certificate(s):");
System.out.println();
MessageDigest sha1 = MessageDigest.getInstance("SHA1");
MessageDigest md5 = MessageDigest.getInstance("MD5");
for (int i = 0; i < chain.length; i++) {
X509Certificate cert = chain[i];
System.out.println(" " + (i + 1) + " Subject " + cert.getSubjectDN());
System.out.println(" Issuer " + cert.getIssuerDN());
sha1.update(cert.getEncoded());
System.out.println(" sha1 " + toHexString(sha1.digest()));
md5.update(cert.getEncoded());
System.out.println(" md5 " + toHexString(md5.digest()));
System.out.println();
}

System.out.println("Enter certificate to add to trusted keystore or 'q' to quit: [1]");
String line = reader.readLine().trim();
int k;
try {
k = (line.length() == 0) ? 0 : Integer.parseInt(line) - 1;
} catch (NumberFormatException e) {
System.out.println("KeyStore not changed");
return;
}

X509Certificate cert = chain[k];
String alias = host + "-" + (k + 1);
ks.setCertificateEntry(alias, cert);

OutputStream out = new FileOutputStream("ssecacerts");
ks.store(out, passphrase);
out.close();

System.out.println();
System.out.println(cert);
System.out.println();
System.out.println("Added certificate to keystore 'jssecacerts' using alias '" + alias + "'");

}

private static final char[] HEXDIGITS = "0123456789abcdef".toCharArray();

private static String toHexString(byte[] bytes) {
StringBuilder sb = new StringBuilder(bytes.length * 3);
for (int b : bytes) {
b &= 0xff;
sb.append(HEXDIGITS[b >> 4]);
sb.append(HEXDIGITS[b & 15]);
sb.append(' ');
}
return sb.toString();
}

private static class SavingTrustManager implements X509TrustManager {

private final X509TrustManager tm;
private X509Certificate[] chain;

SavingTrustManager(X509TrustManager tm) {
this.tm = tm;
}

@Override
public X509Certificate[] getAcceptedIssuers() {
throw new UnsupportedOperationException();
}

@Override
public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
throw new UnsupportedOperationException();
}

@Override
public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
this.chain = chain;
tm.checkServerTrusted(chain, authType);
}
}
}