参与的Java项目在本地能正常运行，但是到了服务器上，在使用到一个功能时报错，看后台日志，报了一个java.lang.NoSuchMethodError
Caused by: java.lang.NoSuchMethodError: org.bouncycastle.jcajce.provider.asymmetric.util.EC5Util.convertPoint(Lorg/bouncycastle/math/ec/ECCurve;Ljava/security/spec/ECPoint;)Lorg/bouncycastle/math/ec/ECPoint;
在pom.xml文件中的确引入了这个包，版本是1.69。本地代码是存在报错中提到这个方法的，要不然编译也不会通过。
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>1.69</version>
</dependency>
为了查看服务器上org.bouncycastle.jcajce.provider.asymmetric.util.EC5Util这个类和我本地是否一样，需要用到反编译工具。反编译工具有很多，我这里使用了阿里开源的Arthas，这个使用方法比较简单。如果你的服务器上没有Arthas，可以参考官方文档进行安装，快速安装只需要两行命令
https://arthas.aliyun.com/doc/install-detail.html
curl -O https://arthas.aliyun.com/arthas-boot.jar
java -jar arthas-boot.jar
启动时选择想要连接的进程。选择后执行jad反编译命令
jad org.bouncycastle.jcajce.provider.asymmetric.util.EC5Util
然后就可以看到
ClassLoader:
+-sun.misc.Launcher$ExtClassLoader@3e151de8
Location:
/usr/lib/jvm/jdk8/jre/lib/ext/bcprov-jdk15on-1.60.jar
/*
* Decompiled with CFR.
*
* Could not load the following classes:
* org.bouncycastle.asn1.ASN1ObjectIdentifier
* org.bouncycastle.asn1.x9.ECNamedCurveTable
* org.bouncycastle.asn1.x9.X962Parameters
* org.bouncycastle.asn1.x9.X9ECParameters
* org.bouncycastle.crypto.ec.CustomNamedCurves
* org.bouncycastle.crypto.params.ECDomainParameters
* org.bouncycastle.jcajce.provider.asymmetric.util.ECUtil
* org.bouncycastle.jcajce.provider.config.ProviderConfiguration
* org.bouncycastle.jce.provider.BouncyCastleProvider
* org.bouncycastle.jce.spec.ECNamedCurveParameterSpec
* org.bouncycastle.jce.spec.ECNamedCurveSpec
* org.bouncycastle.jce.spec.ECParameterSpec
* org.bouncycastle.math.ec.ECAlgorithms
* org.bouncycastle.math.ec.ECCurve
* org.bouncycastle.math.ec.ECCurve$F2m
* org.bouncycastle.math.ec.ECCurve$Fp
* org.bouncycastle.math.ec.ECPoint
* org.bouncycastle.math.field.FiniteField
* org.bouncycastle.math.field.Polynomial
* org.bouncycastle.math.field.PolynomialExtensionField
* org.bouncycastle.util.Arrays
*/
package org.bouncycastle.jcajce.provider.asymmetric.util;
import java.math.BigInteger;
import java.security.spec.ECField;
import java.security.spec.ECFieldF2m;
import java.security.spec.ECFieldFp;
import java.security.spec.ECParameterSpec;
import java.security.spec.ECPoint;
import java.security.spec.EllipticCurve;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.x9.ECNamedCurveTable;
import org.bouncycastle.asn1.x9.X962Parameters;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.crypto.ec.CustomNamedCurves;
import org.bouncycastle.crypto.params.ECDomainParameters;
import org.bouncycastle.jcajce.provider.asymmetric.util.ECUtil;
import org.bouncycastle.jcajce.provider.config.ProviderConfiguration;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.jce.spec.ECNamedCurveParameterSpec;
import org.bouncycastle.jce.spec.ECNamedCurveSpec;
import org.bouncycastle.math.ec.ECAlgorithms;
import org.bouncycastle.math.ec.ECCurve;
import org.bouncycastle.math.field.FiniteField;
import org.bouncycastle.math.field.Polynomial;
import org.bouncycastle.math.field.PolynomialExtensionField;
import org.bouncycastle.util.Arrays;
public class EC5Util {
private static Map customCurves;
public static ECField convertField(FiniteField finiteField) {
if (ECAlgorithms.isFpField((FiniteField)finiteField)) {
return new ECFieldFp(finiteField.getCharacteristic());
}
Polynomial polynomial = ((PolynomialExtensionField)finiteField).getMinimalPolynomial();
int[] nArray = polynomial.getExponentsPresent();
int[] nArray2 = Arrays.reverse((int[])Arrays.copyOfRange((int[])nArray, (int)1, (int)(nArray.length - 1)));
return new ECFieldF2m(polynomial.getDegree(), nArray2);
}
public static ECParameterSpec convertToSpec(X9ECParameters x9ECParameters) {
return new ECParameterSpec(EC5Util.convertCurve(x9ECParameters.getCurve(), null), EC5Util.convertPoint(x9ECParameters.getG()), x9ECParameters.getN(), x9ECParameters.getH().intValue());
}
public static ECParameterSpec convertToSpec(X962Parameters x962Parameters, ECCurve eCCurve) {
ECParameterSpec eCParameterSpec;
if (x962Parameters.isNamedCurve()) {
Map map;
ASN1ObjectIdentifier aSN1ObjectIdentifier = (ASN1ObjectIdentifier)x962Parameters.getParameters();
X9ECParameters x9ECParameters = ECUtil.getNamedCurveByOid((ASN1ObjectIdentifier)aSN1ObjectIdentifier);
if (x9ECParameters == null && !(map = BouncyCastleProvider.CONFIGURATION.getAdditionalECParameters()).isEmpty()) {
x9ECParameters = (X9ECParameters)map.get(aSN1ObjectIdentifier);
}
EllipticCurve ellipticCurve = EC5Util.convertCurve(eCCurve, x9ECParameters.getSeed());
eCParameterSpec = new ECNamedCurveSpec(ECUtil.getCurveName((ASN1ObjectIdentifier)aSN1ObjectIdentifier), ellipticCurve, EC5Util.convertPoint(x9ECParameters.getG()), x9ECParameters.getN(), x9ECParameters.getH());
} else if (x962Parameters.isImplicitlyCA()) {
eCParameterSpec = null;
} else {
X9ECParameters x9ECParameters = X9ECParameters.getInstance((Object)x962Parameters.getParameters());
EllipticCurve ellipticCurve = EC5Util.convertCurve(eCCurve, x9ECParameters.getSeed());
eCParameterSpec = x9ECParameters.getH() != null ? new ECParameterSpec(ellipticCurve, EC5Util.convertPoint(x9ECParameters.getG()), x9ECParameters.getN(), x9ECParameters.getH().intValue()) : new ECParameterSpec(ellipticCurve, EC5Util.convertPoint(x9ECParameters.getG()), x9ECParameters.getN(), 1);
}
return eCParameterSpec;
}
/*
* Enabled force condition propagation
* Lifted jumps to return sites
*/
public static ECCurve getCurve(ProviderConfiguration providerConfiguration, X962Parameters x962Parameters) {
Set set = providerConfiguration.getAcceptableNamedCurves();
if (x962Parameters.isNamedCurve()) {
X9ECParameters x9ECParameters;
ASN1ObjectIdentifier aSN1ObjectIdentifier = ASN1ObjectIdentifier.getInstance((Object)x962Parameters.getParameters());
if (!set.isEmpty()) {
if (!set.contains(aSN1ObjectIdentifier)) throw new IllegalStateException("named curve not acceptable");
}
if ((x9ECParameters = ECUtil.getNamedCurveByOid((ASN1ObjectIdentifier)aSN1ObjectIdentifier)) != null) return x9ECParameters.getCurve();
x9ECParameters = (X9ECParameters)providerConfiguration.getAdditionalECParameters().get(aSN1ObjectIdentifier);
return x9ECParameters.getCurve();
}
if (x962Parameters.isImplicitlyCA()) {
return providerConfiguration.getEcImplicitlyCa().getCurve();
}
if (!set.isEmpty()) throw new IllegalStateException("encoded parameters not acceptable");
X9ECParameters x9ECParameters = X9ECParameters.getInstance((Object)x962Parameters.getParameters());
return x9ECParameters.getCurve();
}
public static ECParameterSpec convertSpec(EllipticCurve ellipticCurve, org.bouncycastle.jce.spec.ECParameterSpec eCParameterSpec) {
if (eCParameterSpec instanceof ECNamedCurveParameterSpec) {
return new ECNamedCurveSpec(((ECNamedCurveParameterSpec)eCParameterSpec).getName(), ellipticCurve, EC5Util.convertPoint(eCParameterSpec.getG()), eCParameterSpec.getN(), eCParameterSpec.getH());
}
return new ECParameterSpec(ellipticCurve, EC5Util.convertPoint(eCParameterSpec.getG()), eCParameterSpec.getN(), eCParameterSpec.getH().intValue());
}
public static org.bouncycastle.jce.spec.ECParameterSpec convertSpec(ECParameterSpec eCParameterSpec, boolean bl) {
ECCurve eCCurve = EC5Util.convertCurve(eCParameterSpec.getCurve());
return new org.bouncycastle.jce.spec.ECParameterSpec(eCCurve, EC5Util.convertPoint(eCCurve, eCParameterSpec.getGenerator(), bl), eCParameterSpec.getOrder(), BigInteger.valueOf(eCParameterSpec.getCofactor()), eCParameterSpec.getCurve().getSeed());
}
public static ECDomainParameters getDomainParameters(ProviderConfiguration providerConfiguration, ECParameterSpec eCParameterSpec) {
ECDomainParameters eCDomainParameters;
if (eCParameterSpec == null) {
org.bouncycastle.jce.spec.ECParameterSpec eCParameterSpec2 = providerConfiguration.getEcImplicitlyCa();
eCDomainParameters = new ECDomainParameters(eCParameterSpec2.getCurve(), eCParameterSpec2.getG(), eCParameterSpec2.getN(), eCParameterSpec2.getH(), eCParameterSpec2.getSeed());
} else {
eCDomainParameters = ECUtil.getDomainParameters((ProviderConfiguration)providerConfiguration, (org.bouncycastle.jce.spec.ECParameterSpec)EC5Util.convertSpec(eCParameterSpec, false));
}
return eCDomainParameters;
}
public static EllipticCurve convertCurve(ECCurve eCCurve, byte[] byArray) {
ECField eCField = EC5Util.convertField(eCCurve.getField());
BigInteger bigInteger = eCCurve.getA().toBigInteger();
BigInteger bigInteger2 = eCCurve.getB().toBigInteger();
return new EllipticCurve(eCField, bigInteger, bigInteger2, null);
}
public static ECCurve convertCurve(EllipticCurve ellipticCurve) {
ECField eCField = ellipticCurve.getField();
BigInteger bigInteger = ellipticCurve.getA();
BigInteger bigInteger2 = ellipticCurve.getB();
if (eCField instanceof ECFieldFp) {
ECCurve.Fp fp = new ECCurve.Fp(((ECFieldFp)eCField).getP(), bigInteger, bigInteger2);
if (customCurves.containsKey(fp)) {
return (ECCurve)customCurves.get(fp);
}
return fp;
}
ECFieldF2m eCFieldF2m = (ECFieldF2m)eCField;
int n = eCFieldF2m.getM();
int[] nArray = ECUtil.convertMidTerms((int[])eCFieldF2m.getMidTermsOfReductionPolynomial());
return new ECCurve.F2m(n, nArray[0], nArray[1], nArray[2], bigInteger, bigInteger2);
}
public static org.bouncycastle.math.ec.ECPoint convertPoint(ECParameterSpec eCParameterSpec, ECPoint eCPoint, boolean bl) {
return EC5Util.convertPoint(EC5Util.convertCurve(eCParameterSpec.getCurve()), eCPoint, bl);
}
public static org.bouncycastle.math.ec.ECPoint convertPoint(ECCurve eCCurve, ECPoint eCPoint, boolean bl) {
return eCCurve.createPoint(eCPoint.getAffineX(), eCPoint.getAffineY());
}
public static ECPoint convertPoint(org.bouncycastle.math.ec.ECPoint eCPoint) {
eCPoint = eCPoint.normalize();
return new ECPoint(eCPoint.getAffineXCoord().toBigInteger(), eCPoint.getAffineYCoord().toBigInteger());
}
static {
Object object;
customCurves = new HashMap();
Enumeration enumeration = CustomNamedCurves.getNames();
while (enumeration.hasMoreElements()) {
object = (String)enumeration.nextElement();
X9ECParameters x9ECParameters = ECNamedCurveTable.getByName((String)object);
if (x9ECParameters == null) continue;
customCurves.put(x9ECParameters.getCurve(), CustomNamedCurves.getByName((String)object).getCurve());
}
object = CustomNamedCurves.getByName((String)"Curve25519");
customCurves.put(new ECCurve.Fp(object.getCurve().getField().getCharacteristic(), object.getCurve().getA().toBigInteger(), object.getCurve().getB().toBigInteger()), object.getCurve());
}
}
Affect(row-cnt:1) cost in 704 ms.
通过靠前的Location:可以看到版本并非pom.xml依赖的1.69版本，实际使用的1.60版本，而且位置是jdk自带的jar包。查看这个类的内容，的确没有报错中那个方法（有方法名相同的，但是形参列表不同）。
到目前为止就找到原因了，是pom.xml引入了与jdk自带jar包同名的包，但是版本不一样。编译时使用了pom.xml引入的，但是在启动程序时，由于Java类加载的顺序，会优先加载jdk自带的类，导致运行时用的EC5Util这个类和编译时的版本不一样，缺少了一些方法，所以报了NoSuchMethodError异常。
解决方法：
我这里是把jdk自带的同名jar包bcprov-jdk15on-1.60.jar移动到了一个不相关的目录，然后重启程序。
当然也可以考虑修改代码，本地和服务器使用同样版本的jdk，使用jdk自带的jar包中的方法，不要从pom.xml中引入。
