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    <p>I think I figured it out. It happened to me today. I was just donig some small test with it, and it didn't work. Here's the code: </p> <pre><code> static class TesteP { private String a; private String b; private String c; public String getA() { return this.a; } public void setA(String a) { this.a = a; } public String getB() { return this.b; } public void setB(String b) { this.b = b; } public String getC() { return this.c; } public void setC(String c) { this.c = c; } @Override public String toString() { return new ToStringBuilder(this.getClass()).add("a", this.a).add("b", this.b).toString(); } } static class RestP { private String a; public String getA() { return this.a; } public void setA(String a) { this.a = a; } @Override public String toString() { return this.a; } } public static void main(String[] args) throws IllegalAccessException, InvocationTargetException, NoSuchMethodException { TesteP p = new TesteP(); p.setA("AAAA"); p.setB("BBB"); TesteP pp = new TesteP(); RestP p2 = new RestP(); p2.setA("aaaa"); PropertyUtils.copyProperties(p,p2); } </code></pre> <p>It solved this making the classes public. Maybe one of your classes isn't public. Here's the solution in my case:</p> <pre><code> public static class TesteP { private String a; private String b; private String c; public String getA() { return this.a; } public void setA(String a) { this.a = a; } public String getB() { return this.b; } public void setB(String b) { this.b = b; } public String getC() { return this.c; } public void setC(String c) { this.c = c; } @Override public String toString() { return new ToStringBuilder(this.getClass()).add("a", this.a).add("b", this.b).toString(); } } public static class RestP { private String a; public String getA() { return this.a; } public void setA(String a) { this.a = a; } @Override public String toString() { return this.a; } } public static void main(String[] args) throws IllegalAccessException, InvocationTargetException, NoSuchMethodException { TesteP p = new TesteP(); p.setA("AAAA"); p.setB("BBB"); TesteP pp = new TesteP(); RestP p2 = new RestP(); p2.setA("aaaa"); PropertyUtils.copyProperties(p,p2); } </code></pre>
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