Mercurial Hosting > luan
annotate src/org/eclipse/jetty/util/Loader.java @ 806:49cbf6ee529f
include property files in build
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Wed, 07 Sep 2016 22:50:42 -0600 |
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1 // |
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2 // ======================================================================== |
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd. |
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4 // ------------------------------------------------------------------------ |
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5 // All rights reserved. This program and the accompanying materials |
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6 // are made available under the terms of the Eclipse Public License v1.0 |
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7 // and Apache License v2.0 which accompanies this distribution. |
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8 // |
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9 // The Eclipse Public License is available at |
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10 // http://www.eclipse.org/legal/epl-v10.html |
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11 // |
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12 // The Apache License v2.0 is available at |
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13 // http://www.opensource.org/licenses/apache2.0.php |
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14 // |
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15 // You may elect to redistribute this code under either of these licenses. |
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16 // ======================================================================== |
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17 // |
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18 |
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19 package org.eclipse.jetty.util; |
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20 |
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21 import java.io.File; |
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22 import java.net.URL; |
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23 import java.net.URLClassLoader; |
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24 import java.util.Locale; |
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25 import java.util.MissingResourceException; |
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26 import java.util.ResourceBundle; |
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27 |
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28 import org.eclipse.jetty.util.resource.Resource; |
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29 |
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30 /* ------------------------------------------------------------ */ |
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31 /** ClassLoader Helper. |
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32 * This helper class allows classes to be loaded either from the |
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33 * Thread's ContextClassLoader, the classloader of the derived class |
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34 * or the system ClassLoader. |
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35 * |
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36 * <B>Usage:</B><PRE> |
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37 * public class MyClass { |
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38 * void myMethod() { |
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39 * ... |
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40 * Class c=Loader.loadClass(this.getClass(),classname); |
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41 * ... |
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42 * } |
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43 * </PRE> |
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44 * |
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45 */ |
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46 public class Loader |
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47 { |
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48 /* ------------------------------------------------------------ */ |
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49 public static URL getResource(Class<?> loadClass,String name, boolean checkParents) |
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50 { |
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51 URL url =null; |
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52 ClassLoader loader=Thread.currentThread().getContextClassLoader(); |
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53 while (url==null && loader!=null ) |
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54 { |
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55 url=loader.getResource(name); |
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56 loader=(url==null&&checkParents)?loader.getParent():null; |
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57 } |
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58 |
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59 loader=loadClass==null?null:loadClass.getClassLoader(); |
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60 while (url==null && loader!=null ) |
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61 { |
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62 url=loader.getResource(name); |
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63 loader=(url==null&&checkParents)?loader.getParent():null; |
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64 } |
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65 |
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66 if (url==null) |
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67 { |
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68 url=ClassLoader.getSystemResource(name); |
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69 } |
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70 |
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71 return url; |
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72 } |
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73 |
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74 /* ------------------------------------------------------------ */ |
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75 @SuppressWarnings("rawtypes") |
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76 public static Class loadClass(Class loadClass,String name) |
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77 throws ClassNotFoundException |
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78 { |
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79 return loadClass(loadClass,name,false); |
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80 } |
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81 |
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82 /* ------------------------------------------------------------ */ |
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83 /** Load a class. |
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84 * |
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85 * @param loadClass |
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86 * @param name |
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87 * @param checkParents If true, try loading directly from parent classloaders. |
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88 * @return Class |
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89 * @throws ClassNotFoundException |
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90 */ |
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91 @SuppressWarnings("rawtypes") |
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92 public static Class loadClass(Class loadClass,String name,boolean checkParents) |
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93 throws ClassNotFoundException |
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94 { |
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95 ClassNotFoundException ex=null; |
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96 Class<?> c =null; |
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97 ClassLoader loader=Thread.currentThread().getContextClassLoader(); |
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98 while (c==null && loader!=null ) |
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99 { |
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100 try { c=loader.loadClass(name); } |
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101 catch (ClassNotFoundException e) {if(ex==null)ex=e;} |
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102 loader=(c==null&&checkParents)?loader.getParent():null; |
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103 } |
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104 |
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105 loader=loadClass==null?null:loadClass.getClassLoader(); |
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106 while (c==null && loader!=null ) |
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107 { |
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108 try { c=loader.loadClass(name); } |
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109 catch (ClassNotFoundException e) {if(ex==null)ex=e;} |
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110 loader=(c==null&&checkParents)?loader.getParent():null; |
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111 } |
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112 |
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113 if (c==null) |
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114 { |
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115 try { c=Class.forName(name); } |
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116 catch (ClassNotFoundException e) {if(ex==null)ex=e;} |
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117 } |
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118 |
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119 if (c!=null) |
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120 return c; |
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121 throw ex; |
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122 } |
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123 |
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124 |
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125 |
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126 /* ------------------------------------------------------------ */ |
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127 public static ResourceBundle getResourceBundle(Class<?> loadClass,String name,boolean checkParents, Locale locale) |
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128 throws MissingResourceException |
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129 { |
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130 MissingResourceException ex=null; |
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131 ResourceBundle bundle =null; |
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132 ClassLoader loader=Thread.currentThread().getContextClassLoader(); |
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133 while (bundle==null && loader!=null ) |
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134 { |
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135 try { bundle=ResourceBundle.getBundle(name, locale, loader); } |
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136 catch (MissingResourceException e) {if(ex==null)ex=e;} |
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137 loader=(bundle==null&&checkParents)?loader.getParent():null; |
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138 } |
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139 |
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140 loader=loadClass==null?null:loadClass.getClassLoader(); |
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141 while (bundle==null && loader!=null ) |
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142 { |
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143 try { bundle=ResourceBundle.getBundle(name, locale, loader); } |
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144 catch (MissingResourceException e) {if(ex==null)ex=e;} |
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145 loader=(bundle==null&&checkParents)?loader.getParent():null; |
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146 } |
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147 |
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148 if (bundle==null) |
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149 { |
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150 try { bundle=ResourceBundle.getBundle(name, locale); } |
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151 catch (MissingResourceException e) {if(ex==null)ex=e;} |
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152 } |
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153 |
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154 if (bundle!=null) |
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155 return bundle; |
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156 throw ex; |
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157 } |
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158 |
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159 |
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160 /* ------------------------------------------------------------ */ |
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161 /** |
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162 * Generate the classpath (as a string) of all classloaders |
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163 * above the given classloader. |
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164 * |
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165 * This is primarily used for jasper. |
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166 * @return the system class path |
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167 */ |
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168 public static String getClassPath(ClassLoader loader) throws Exception |
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169 { |
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170 StringBuilder classpath=new StringBuilder(); |
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171 while (loader != null && (loader instanceof URLClassLoader)) |
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172 { |
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173 URL[] urls = ((URLClassLoader)loader).getURLs(); |
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174 if (urls != null) |
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175 { |
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176 for (int i=0;i<urls.length;i++) |
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177 { |
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178 Resource resource = Resource.newResource(urls[i]); |
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179 File file=resource.getFile(); |
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180 if (file!=null && file.exists()) |
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181 { |
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182 if (classpath.length()>0) |
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183 classpath.append(File.pathSeparatorChar); |
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184 classpath.append(file.getAbsolutePath()); |
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185 } |
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186 } |
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187 } |
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188 loader = loader.getParent(); |
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189 } |
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190 return classpath.toString(); |
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191 } |
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192 } |
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193 |